chromiumos: restore common.PrepareForBuildResponse

Various places in recipes still use this.

BUG=chromium:1034529
TEST=generate, train

Change-Id: I3f3337fea198cccce90fdf5fc2396443f47bf854
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2172710
Tested-by: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
diff --git a/go/chromiumos/common.pb.go b/go/chromiumos/common.pb.go
index f990439..081c486 100644
--- a/go/chromiumos/common.pb.go
+++ b/go/chromiumos/common.pb.go
@@ -218,6 +218,42 @@
 	return fileDescriptor_fa0b57c3d7d4c63b, []int{6, 0}
 }
 
+// Does this artifact require a build?
+type PrepareForBuildResponse_BuildRelevance int32
+
+const (
+	PrepareForBuildResponse_UNSPECIFIED PrepareForBuildResponse_BuildRelevance = 0
+	// Build is necessary to generate artifacts.
+	PrepareForBuildResponse_NEEDED PrepareForBuildResponse_BuildRelevance = 1
+	// Defer to other artifacts.  Used primarily for aggregation of artifact
+	// results.
+	PrepareForBuildResponse_UNKNOWN PrepareForBuildResponse_BuildRelevance = 2
+	// Artifacts are already generated.  The build is pointless.
+	PrepareForBuildResponse_POINTLESS PrepareForBuildResponse_BuildRelevance = 3
+)
+
+var PrepareForBuildResponse_BuildRelevance_name = map[int32]string{
+	0: "UNSPECIFIED",
+	1: "NEEDED",
+	2: "UNKNOWN",
+	3: "POINTLESS",
+}
+
+var PrepareForBuildResponse_BuildRelevance_value = map[string]int32{
+	"UNSPECIFIED": 0,
+	"NEEDED":      1,
+	"UNKNOWN":     2,
+	"POINTLESS":   3,
+}
+
+func (x PrepareForBuildResponse_BuildRelevance) String() string {
+	return proto.EnumName(PrepareForBuildResponse_BuildRelevance_name, int32(x))
+}
+
+func (PrepareForBuildResponse_BuildRelevance) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{13, 0}
+}
+
 // Legacy artifacts, handled in cros_artifacts.  DO NOT ADD TO THIS.
 type ArtifactsByService_Legacy_ArtifactType int32
 
@@ -288,7 +324,7 @@
 }
 
 func (ArtifactsByService_Legacy_ArtifactType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 0, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 0, 0}
 }
 
 // Artifacts which the ArtifactsService endpoints pass to ToolchainService.
@@ -364,7 +400,7 @@
 }
 
 func (ArtifactsByService_Toolchain_ArtifactType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 1, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 1, 0}
 }
 
 // Artifacts which the ArtifactsService endpoints pass to ImageService.
@@ -387,7 +423,7 @@
 }
 
 func (ArtifactsByService_Image_ArtifactType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 2, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 2, 0}
 }
 
 // Artifacts which the ArtifactsService endpoints pass to PackageService.
@@ -410,7 +446,7 @@
 }
 
 func (ArtifactsByService_Package_ArtifactType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 3, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 3, 0}
 }
 
 // Artifacts which the ArtifactsService endpoints pass to SysrootService.
@@ -433,7 +469,7 @@
 }
 
 func (ArtifactsByService_Sysroot_ArtifactType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 4, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 4, 0}
 }
 
 // Artifacts which the ArtifactsService endpoints pass to TestService.
@@ -456,7 +492,7 @@
 }
 
 func (ArtifactsByService_Test_ArtifactType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 5, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 5, 0}
 }
 
 // BuildTarget encapsulates a number of related arguments. At the moment, the
@@ -1240,6 +1276,47 @@
 	return nil
 }
 
+// TODO(crbug/1019868): Consider migrating
+// chromite.api.toolchain.PrepareForToolchainBuildRequest as well.
+type PrepareForBuildResponse struct {
+	BuildRelevance       PrepareForBuildResponse_BuildRelevance `protobuf:"varint,1,opt,name=build_relevance,json=buildRelevance,proto3,enum=chromiumos.PrepareForBuildResponse_BuildRelevance" json:"build_relevance,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                               `json:"-"`
+	XXX_unrecognized     []byte                                 `json:"-"`
+	XXX_sizecache        int32                                  `json:"-"`
+}
+
+func (m *PrepareForBuildResponse) Reset()         { *m = PrepareForBuildResponse{} }
+func (m *PrepareForBuildResponse) String() string { return proto.CompactTextString(m) }
+func (*PrepareForBuildResponse) ProtoMessage()    {}
+func (*PrepareForBuildResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{13}
+}
+
+func (m *PrepareForBuildResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_PrepareForBuildResponse.Unmarshal(m, b)
+}
+func (m *PrepareForBuildResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_PrepareForBuildResponse.Marshal(b, m, deterministic)
+}
+func (m *PrepareForBuildResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_PrepareForBuildResponse.Merge(m, src)
+}
+func (m *PrepareForBuildResponse) XXX_Size() int {
+	return xxx_messageInfo_PrepareForBuildResponse.Size(m)
+}
+func (m *PrepareForBuildResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_PrepareForBuildResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_PrepareForBuildResponse proto.InternalMessageInfo
+
+func (m *PrepareForBuildResponse) GetBuildRelevance() PrepareForBuildResponse_BuildRelevance {
+	if m != nil {
+		return m.BuildRelevance
+	}
+	return PrepareForBuildResponse_UNSPECIFIED
+}
+
 // Additional information about artifacts used by PrepareForBuild endpoints.
 // TODO(crbug/1019868): This is migrating to ArtifactProfileInfo.
 type PrepareForBuildAdditionalArgs struct {
@@ -1256,7 +1333,7 @@
 func (m *PrepareForBuildAdditionalArgs) String() string { return proto.CompactTextString(m) }
 func (*PrepareForBuildAdditionalArgs) ProtoMessage()    {}
 func (*PrepareForBuildAdditionalArgs) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{13}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{14}
 }
 
 func (m *PrepareForBuildAdditionalArgs) XXX_Unmarshal(b []byte) error {
@@ -1342,7 +1419,7 @@
 func (m *AfdoRelease) String() string { return proto.CompactTextString(m) }
 func (*AfdoRelease) ProtoMessage()    {}
 func (*AfdoRelease) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{14}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{15}
 }
 
 func (m *AfdoRelease) XXX_Unmarshal(b []byte) error {
@@ -1394,7 +1471,7 @@
 func (m *ArtifactProfileInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactProfileInfo) ProtoMessage()    {}
 func (*ArtifactProfileInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{15}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{16}
 }
 
 func (m *ArtifactProfileInfo) XXX_Unmarshal(b []byte) error {
@@ -1495,7 +1572,7 @@
 func (m *ArtifactsByService) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService) ProtoMessage()    {}
 func (*ArtifactsByService) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17}
 }
 
 func (m *ArtifactsByService) XXX_Unmarshal(b []byte) error {
@@ -1581,7 +1658,7 @@
 func (m *ArtifactsByService_Legacy) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Legacy) ProtoMessage()    {}
 func (*ArtifactsByService_Legacy) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 0}
 }
 
 func (m *ArtifactsByService_Legacy) XXX_Unmarshal(b []byte) error {
@@ -1650,7 +1727,7 @@
 func (m *ArtifactsByService_Legacy_ArtifactInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Legacy_ArtifactInfo) ProtoMessage()    {}
 func (*ArtifactsByService_Legacy_ArtifactInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 0, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 0, 0}
 }
 
 func (m *ArtifactsByService_Legacy_ArtifactInfo) XXX_Unmarshal(b []byte) error {
@@ -1706,7 +1783,7 @@
 func (m *ArtifactsByService_Toolchain) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Toolchain) ProtoMessage()    {}
 func (*ArtifactsByService_Toolchain) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 1}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 1}
 }
 
 func (m *ArtifactsByService_Toolchain) XXX_Unmarshal(b []byte) error {
@@ -1775,7 +1852,7 @@
 func (m *ArtifactsByService_Toolchain_ArtifactInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Toolchain_ArtifactInfo) ProtoMessage()    {}
 func (*ArtifactsByService_Toolchain_ArtifactInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 1, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 1, 0}
 }
 
 func (m *ArtifactsByService_Toolchain_ArtifactInfo) XXX_Unmarshal(b []byte) error {
@@ -1824,7 +1901,7 @@
 func (m *ArtifactsByService_Image) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Image) ProtoMessage()    {}
 func (*ArtifactsByService_Image) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 2}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 2}
 }
 
 func (m *ArtifactsByService_Image) XXX_Unmarshal(b []byte) error {
@@ -1891,7 +1968,7 @@
 func (m *ArtifactsByService_Image_ArtifactInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Image_ArtifactInfo) ProtoMessage()    {}
 func (*ArtifactsByService_Image_ArtifactInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 2, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 2, 0}
 }
 
 func (m *ArtifactsByService_Image_ArtifactInfo) XXX_Unmarshal(b []byte) error {
@@ -1940,7 +2017,7 @@
 func (m *ArtifactsByService_Package) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Package) ProtoMessage()    {}
 func (*ArtifactsByService_Package) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 3}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 3}
 }
 
 func (m *ArtifactsByService_Package) XXX_Unmarshal(b []byte) error {
@@ -2009,7 +2086,7 @@
 func (m *ArtifactsByService_Package_ArtifactInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Package_ArtifactInfo) ProtoMessage()    {}
 func (*ArtifactsByService_Package_ArtifactInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 3, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 3, 0}
 }
 
 func (m *ArtifactsByService_Package_ArtifactInfo) XXX_Unmarshal(b []byte) error {
@@ -2058,7 +2135,7 @@
 func (m *ArtifactsByService_Sysroot) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Sysroot) ProtoMessage()    {}
 func (*ArtifactsByService_Sysroot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 4}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 4}
 }
 
 func (m *ArtifactsByService_Sysroot) XXX_Unmarshal(b []byte) error {
@@ -2127,7 +2204,7 @@
 func (m *ArtifactsByService_Sysroot_ArtifactInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Sysroot_ArtifactInfo) ProtoMessage()    {}
 func (*ArtifactsByService_Sysroot_ArtifactInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 4, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 4, 0}
 }
 
 func (m *ArtifactsByService_Sysroot_ArtifactInfo) XXX_Unmarshal(b []byte) error {
@@ -2176,7 +2253,7 @@
 func (m *ArtifactsByService_Test) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Test) ProtoMessage()    {}
 func (*ArtifactsByService_Test) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 5}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 5}
 }
 
 func (m *ArtifactsByService_Test) XXX_Unmarshal(b []byte) error {
@@ -2243,7 +2320,7 @@
 func (m *ArtifactsByService_Test_ArtifactInfo) String() string { return proto.CompactTextString(m) }
 func (*ArtifactsByService_Test_ArtifactInfo) ProtoMessage()    {}
 func (*ArtifactsByService_Test_ArtifactInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{16, 5, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 5, 0}
 }
 
 func (m *ArtifactsByService_Test_ArtifactInfo) XXX_Unmarshal(b []byte) error {
@@ -2296,7 +2373,7 @@
 func (m *UploadedArtifactsByService) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService) ProtoMessage()    {}
 func (*UploadedArtifactsByService) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18}
 }
 
 func (m *UploadedArtifactsByService) XXX_Unmarshal(b []byte) error {
@@ -2373,7 +2450,7 @@
 func (m *UploadedArtifactsByService_Legacy) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService_Legacy) ProtoMessage()    {}
 func (*UploadedArtifactsByService_Legacy) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 0}
 }
 
 func (m *UploadedArtifactsByService_Legacy) XXX_Unmarshal(b []byte) error {
@@ -2419,7 +2496,7 @@
 }
 func (*UploadedArtifactsByService_Legacy_ArtifactPaths) ProtoMessage() {}
 func (*UploadedArtifactsByService_Legacy_ArtifactPaths) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 0, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 0, 0}
 }
 
 func (m *UploadedArtifactsByService_Legacy_ArtifactPaths) XXX_Unmarshal(b []byte) error {
@@ -2465,7 +2542,7 @@
 func (m *UploadedArtifactsByService_Toolchain) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService_Toolchain) ProtoMessage()    {}
 func (*UploadedArtifactsByService_Toolchain) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 1}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 1}
 }
 
 func (m *UploadedArtifactsByService_Toolchain) XXX_Unmarshal(b []byte) error {
@@ -2511,7 +2588,7 @@
 }
 func (*UploadedArtifactsByService_Toolchain_ArtifactPaths) ProtoMessage() {}
 func (*UploadedArtifactsByService_Toolchain_ArtifactPaths) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 1, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 1, 0}
 }
 
 func (m *UploadedArtifactsByService_Toolchain_ArtifactPaths) XXX_Unmarshal(b []byte) error {
@@ -2557,7 +2634,7 @@
 func (m *UploadedArtifactsByService_Image) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService_Image) ProtoMessage()    {}
 func (*UploadedArtifactsByService_Image) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 2}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 2}
 }
 
 func (m *UploadedArtifactsByService_Image) XXX_Unmarshal(b []byte) error {
@@ -2603,7 +2680,7 @@
 }
 func (*UploadedArtifactsByService_Image_ArtifactPaths) ProtoMessage() {}
 func (*UploadedArtifactsByService_Image_ArtifactPaths) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 2, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 2, 0}
 }
 
 func (m *UploadedArtifactsByService_Image_ArtifactPaths) XXX_Unmarshal(b []byte) error {
@@ -2649,7 +2726,7 @@
 func (m *UploadedArtifactsByService_Package) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService_Package) ProtoMessage()    {}
 func (*UploadedArtifactsByService_Package) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 3}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 3}
 }
 
 func (m *UploadedArtifactsByService_Package) XXX_Unmarshal(b []byte) error {
@@ -2695,7 +2772,7 @@
 }
 func (*UploadedArtifactsByService_Package_ArtifactPaths) ProtoMessage() {}
 func (*UploadedArtifactsByService_Package_ArtifactPaths) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 3, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 3, 0}
 }
 
 func (m *UploadedArtifactsByService_Package_ArtifactPaths) XXX_Unmarshal(b []byte) error {
@@ -2741,7 +2818,7 @@
 func (m *UploadedArtifactsByService_Sysroot) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService_Sysroot) ProtoMessage()    {}
 func (*UploadedArtifactsByService_Sysroot) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 4}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 4}
 }
 
 func (m *UploadedArtifactsByService_Sysroot) XXX_Unmarshal(b []byte) error {
@@ -2787,7 +2864,7 @@
 }
 func (*UploadedArtifactsByService_Sysroot_ArtifactPaths) ProtoMessage() {}
 func (*UploadedArtifactsByService_Sysroot_ArtifactPaths) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 4, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 4, 0}
 }
 
 func (m *UploadedArtifactsByService_Sysroot_ArtifactPaths) XXX_Unmarshal(b []byte) error {
@@ -2833,7 +2910,7 @@
 func (m *UploadedArtifactsByService_Test) String() string { return proto.CompactTextString(m) }
 func (*UploadedArtifactsByService_Test) ProtoMessage()    {}
 func (*UploadedArtifactsByService_Test) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 5}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 5}
 }
 
 func (m *UploadedArtifactsByService_Test) XXX_Unmarshal(b []byte) error {
@@ -2879,7 +2956,7 @@
 }
 func (*UploadedArtifactsByService_Test_ArtifactPaths) ProtoMessage() {}
 func (*UploadedArtifactsByService_Test_ArtifactPaths) Descriptor() ([]byte, []int) {
-	return fileDescriptor_fa0b57c3d7d4c63b, []int{17, 5, 0}
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{18, 5, 0}
 }
 
 func (m *UploadedArtifactsByService_Test_ArtifactPaths) XXX_Unmarshal(b []byte) error {
@@ -2920,6 +2997,7 @@
 	proto.RegisterEnum("chromiumos.AFDOArtifactType", AFDOArtifactType_name, AFDOArtifactType_value)
 	proto.RegisterEnum("chromiumos.GomaConfig_GomaApproach", GomaConfig_GomaApproach_name, GomaConfig_GomaApproach_value)
 	proto.RegisterEnum("chromiumos.Path_Location", Path_Location_name, Path_Location_value)
+	proto.RegisterEnum("chromiumos.PrepareForBuildResponse_BuildRelevance", PrepareForBuildResponse_BuildRelevance_name, PrepareForBuildResponse_BuildRelevance_value)
 	proto.RegisterEnum("chromiumos.ArtifactsByService_Legacy_ArtifactType", ArtifactsByService_Legacy_ArtifactType_name, ArtifactsByService_Legacy_ArtifactType_value)
 	proto.RegisterEnum("chromiumos.ArtifactsByService_Toolchain_ArtifactType", ArtifactsByService_Toolchain_ArtifactType_name, ArtifactsByService_Toolchain_ArtifactType_value)
 	proto.RegisterEnum("chromiumos.ArtifactsByService_Image_ArtifactType", ArtifactsByService_Image_ArtifactType_name, ArtifactsByService_Image_ArtifactType_value)
@@ -2940,6 +3018,7 @@
 	proto.RegisterType((*GitilesCommit)(nil), "chromiumos.GitilesCommit")
 	proto.RegisterType((*UseFlag)(nil), "chromiumos.UseFlag")
 	proto.RegisterType((*ProtoBytes)(nil), "chromiumos.ProtoBytes")
+	proto.RegisterType((*PrepareForBuildResponse)(nil), "chromiumos.PrepareForBuildResponse")
 	proto.RegisterType((*PrepareForBuildAdditionalArgs)(nil), "chromiumos.PrepareForBuildAdditionalArgs")
 	proto.RegisterType((*AfdoRelease)(nil), "chromiumos.AfdoRelease")
 	proto.RegisterType((*ArtifactProfileInfo)(nil), "chromiumos.ArtifactProfileInfo")
@@ -2974,148 +3053,153 @@
 func init() { proto.RegisterFile("chromiumos/common.proto", fileDescriptor_fa0b57c3d7d4c63b) }
 
 var fileDescriptor_fa0b57c3d7d4c63b = []byte{
-	// 2273 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x59, 0xcd, 0x8f, 0x23, 0x47,
-	0x15, 0xdf, 0xb6, 0x3d, 0xfe, 0x78, 0xfe, 0x98, 0xde, 0xda, 0x8f, 0xf1, 0x3a, 0x99, 0x64, 0xb7,
-	0x77, 0x97, 0x6c, 0x96, 0x30, 0xb3, 0x4c, 0xb2, 0x44, 0x84, 0xf0, 0xd1, 0x6e, 0xb7, 0x3d, 0x4e,
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+	0x78, 0xf1, 0xf8, 0xcd, 0x42, 0x4a, 0x3e, 0x10, 0x6b, 0x92, 0x76, 0x22, 0x37, 0x78, 0x0e, 0xed,
+	0xc0, 0xb5, 0x96, 0xd4, 0x6c, 0x69, 0xed, 0x46, 0x45, 0x6c, 0x49, 0x5a, 0x43, 0x3c, 0xae, 0xab,
+	0x22, 0x7d, 0x51, 0x21, 0xc8, 0x89, 0xed, 0x96, 0xca, 0x84, 0x55, 0xb9, 0x2e, 0x35, 0xf9, 0x28,
+	0xca, 0x01, 0xb4, 0xc4, 0x09, 0x1d, 0xa3, 0x8b, 0x1b, 0xb2, 0xa2, 0x48, 0x15, 0xad, 0xd6, 0xa6,
+	0x7a, 0xcc, 0x70, 0x93, 0xdf, 0xa2, 0x8f, 0xb3, 0xaa, 0x8c, 0x0f, 0x8e, 0x44, 0x2c, 0xf1, 0x71,
+	0xba, 0x07, 0xa9, 0xd4, 0x96, 0xeb, 0x15, 0xad, 0xae, 0xd6, 0x9a, 0x7c, 0x02, 0x5d, 0x83, 0xed,
+	0xf2, 0x3e, 0x56, 0x0f, 0x24, 0xb5, 0xa9, 0x95, 0x55, 0xa5, 0x2a, 0xd7, 0xf8, 0x24, 0x35, 0x5e,
+	0x6e, 0x48, 0x1a, 0x96, 0x1a, 0x2a, 0x6e, 0xf1, 0x29, 0xba, 0x01, 0x6f, 0xa3, 0x22, 0x2e, 0xef,
+	0xcb, 0x87, 0x52, 0x93, 0x07, 0x21, 0x96, 0x4c, 0xf3, 0x3b, 0xf9, 0x3f, 0xc5, 0x21, 0x35, 0x69,
+	0x6a, 0xf4, 0xc9, 0xaa, 0x0a, 0x7c, 0xb2, 0xee, 0xb9, 0xf0, 0xea, 0x22, 0xfc, 0xde, 0xca, 0x22,
+	0xbc, 0xa0, 0x83, 0x85, 0x3a, 0xfc, 0xe5, 0x7c, 0x1d, 0x3e, 0x5f, 0x51, 0x87, 0x9b, 0x3b, 0xbc,
+	0x58, 0x29, 0x0a, 0xff, 0x8a, 0x9e, 0x57, 0x46, 0xf7, 0xe0, 0x76, 0x5b, 0x39, 0x94, 0x30, 0xa3,
+	0x35, 0x2f, 0x9b, 0x5a, 0xbd, 0x7e, 0x78, 0xa0, 0xa9, 0xb8, 0x22, 0x61, 0x5a, 0x21, 0x7c, 0x1a,
+	0x09, 0xf0, 0xc6, 0x39, 0x3a, 0x19, 0xf4, 0x06, 0xe4, 0x7d, 0x51, 0xb9, 0x2e, 0x2a, 0x35, 0xed,
+	0x48, 0xc4, 0x8a, 0xac, 0xd4, 0x9a, 0xac, 0xca, 0xf8, 0x2c, 0x7a, 0x1d, 0x76, 0x43, 0x9e, 0xd8,
+	0xf2, 0x46, 0x4d, 0xf5, 0xa4, 0x39, 0xf4, 0x36, 0xdc, 0x5f, 0xdc, 0x47, 0x49, 0x52, 0xca, 0xfb,
+	0x07, 0x22, 0x7e, 0xaa, 0x89, 0xd5, 0x8a, 0xaf, 0xba, 0x8d, 0xde, 0x82, 0xbb, 0xeb, 0x28, 0xf2,
+	0xe8, 0x0e, 0xec, 0x4d, 0x14, 0x9f, 0x4a, 0x58, 0x91, 0xea, 0x5a, 0xf9, 0xa8, 0x11, 0x52, 0xb9,
+	0x8a, 0xee, 0xc2, 0x9b, 0x21, 0xb7, 0x4b, 0x95, 0xd0, 0x9c, 0x52, 0x00, 0x72, 0x46, 0xe9, 0xda,
+	0x8c, 0xb3, 0xa5, 0x2a, 0xd7, 0x69, 0x84, 0x26, 0x2a, 0x58, 0xaa, 0x4b, 0x62, 0x53, 0x0a, 0xc9,
+	0x6f, 0x9c, 0x17, 0x83, 0x86, 0x84, 0xab, 0x9e, 0xea, 0x4d, 0xda, 0xb1, 0xbe, 0xbc, 0x22, 0x95,
+	0xda, 0x35, 0xad, 0x24, 0x2b, 0x22, 0x3e, 0xe6, 0x77, 0x84, 0x58, 0x92, 0xe3, 0x21, 0xff, 0xef,
+	0x08, 0x6c, 0xb1, 0xab, 0x0e, 0x9d, 0xac, 0xea, 0xaa, 0xaf, 0xae, 0x73, 0x53, 0xbe, 0xba, 0xa3,
+	0x9e, 0xaf, 0xec, 0xa8, 0x0b, 0x18, 0x5f, 0xe8, 0xa6, 0x9f, 0xcf, 0x77, 0xd3, 0xb3, 0x15, 0xdd,
+	0xb4, 0x99, 0xb3, 0x0b, 0x76, 0xd2, 0xfd, 0x73, 0x1a, 0x89, 0x05, 0x7e, 0x27, 0xff, 0x65, 0x04,
+	0x12, 0xfe, 0x2b, 0x01, 0x3d, 0x5f, 0x15, 0xfa, 0x77, 0xd7, 0x7b, 0x66, 0xbc, 0x3a, 0xf8, 0x9f,
+	0xac, 0x0c, 0xfe, 0x85, 0xcc, 0x2f, 0x84, 0xff, 0x17, 0xf3, 0xe1, 0x3f, 0x59, 0x11, 0xfe, 0x4d,
+	0xdd, 0x5d, 0x7e, 0x02, 0xfc, 0x47, 0xd6, 0xc5, 0x13, 0xe0, 0x1b, 0xb8, 0xac, 0x04, 0x2c, 0x35,
+	0x7f, 0x79, 0x09, 0x98, 0x77, 0x77, 0xb9, 0x09, 0xf8, 0x67, 0x04, 0x62, 0xf4, 0x99, 0x8a, 0x8e,
+	0x57, 0x45, 0xff, 0xf1, 0x1a, 0x8f, 0xdc, 0x57, 0x87, 0xfe, 0xe3, 0x95, 0xa1, 0xdf, 0xdc, 0xf6,
+	0x42, 0xdc, 0x7f, 0x36, 0x1f, 0xf7, 0xa3, 0x15, 0x71, 0xdf, 0xc8, 0xd7, 0xa5, 0x06, 0x5d, 0xf8,
+	0x6d, 0x0e, 0xf2, 0xed, 0xf1, 0xd0, 0xd2, 0xbb, 0xa4, 0xbb, 0x64, 0x56, 0x93, 0xe6, 0x66, 0xb5,
+	0xaf, 0xcc, 0x7c, 0x68, 0x5d, 0xb9, 0x6e, 0x7e, 0x66, 0x53, 0x16, 0x67, 0xb6, 0xc7, 0x6b, 0x5a,
+	0x5a, 0x3a, 0xbb, 0x95, 0x66, 0x67, 0xb7, 0x77, 0xd6, 0xb4, 0x35, 0x33, 0xc3, 0xed, 0xcf, 0xcf,
+	0x70, 0x85, 0x35, 0xad, 0x2c, 0xcc, 0x72, 0xfb, 0xf3, 0xb3, 0xdc, 0xba, 0x96, 0x16, 0x66, 0xba,
+	0x6f, 0xcf, 0xcc, 0x74, 0xff, 0xbf, 0x6e, 0x88, 0x26, 0xb3, 0x5d, 0xfe, 0x6f, 0xdc, 0x64, 0x2e,
+	0x3b, 0x86, 0xd4, 0x7c, 0xff, 0x7c, 0x63, 0xa3, 0xec, 0x4d, 0x67, 0x0d, 0xdd, 0x1d, 0x38, 0x78,
+	0x6a, 0x2d, 0xff, 0x23, 0xc8, 0xce, 0xc8, 0xd0, 0x11, 0x64, 0x67, 0x0a, 0x7d, 0xd9, 0xf7, 0xa4,
+	0x35, 0xa7, 0xa6, 0x4c, 0xb8, 0xd2, 0xd1, 0x75, 0xd8, 0x1a, 0x53, 0x0f, 0x7e, 0x85, 0x7b, 0x44,
+	0xfe, 0x1f, 0x5c, 0xf8, 0xf9, 0xff, 0x7c, 0x11, 0xe8, 0xb7, 0x36, 0x2d, 0xae, 0xd5, 0x58, 0x7f,
+	0xc2, 0xcd, 0x83, 0x3d, 0x59, 0x0e, 0xf6, 0x82, 0x4f, 0xf3, 0x75, 0xf0, 0xfe, 0x85, 0x0b, 0x1e,
+	0x65, 0xcf, 0x16, 0xb1, 0x7e, 0xb0, 0x49, 0xf1, 0xaf, 0xc6, 0xf9, 0xc3, 0x79, 0x98, 0x87, 0xcb,
+	0x61, 0x5e, 0xe0, 0xcd, 0xb4, 0x0e, 0xc4, 0xbf, 0x73, 0xd3, 0xe7, 0xcf, 0xc9, 0x22, 0xc8, 0x0f,
+	0x37, 0xeb, 0xcd, 0xd5, 0x30, 0x7f, 0x3c, 0x0f, 0xf3, 0xd9, 0x72, 0x98, 0x17, 0x7a, 0x9b, 0xac,
+	0x0b, 0x34, 0x78, 0x66, 0xfc, 0x0f, 0x40, 0xe7, 0xaf, 0xe6, 0x4b, 0x03, 0xba, 0xf4, 0x0d, 0xb0,
+	0x0e, 0xd0, 0x3f, 0x73, 0xfe, 0x75, 0x7e, 0xb4, 0x88, 0xf2, 0xeb, 0x1b, 0x9c, 0x6c, 0xab, 0x21,
+	0xfe, 0x60, 0x1e, 0x62, 0x7b, 0x39, 0xc4, 0xcd, 0xaf, 0xdb, 0x35, 0xf0, 0x3d, 0xfc, 0x1d, 0x07,
+	0x29, 0x56, 0xec, 0x4c, 0x67, 0x17, 0xae, 0x7b, 0xdf, 0x2a, 0x5a, 0xc7, 0x0d, 0x49, 0x6b, 0x2b,
+	0x15, 0xa9, 0x2a, 0x2b, 0x6c, 0x4e, 0x4e, 0x42, 0xac, 0x24, 0x36, 0x25, 0x9e, 0x43, 0x09, 0x88,
+	0x56, 0xa4, 0x43, 0x3e, 0x42, 0x59, 0x2d, 0xa9, 0xd9, 0xe2, 0xa3, 0x28, 0x0d, 0x09, 0x2a, 0xd4,
+	0x0e, 0x0f, 0xf8, 0x18, 0x25, 0xd8, 0xc7, 0x96, 0xc3, 0x03, 0xef, 0x03, 0x0a, 0x96, 0xca, 0xea,
+	0xa1, 0x84, 0x8f, 0xf9, 0x38, 0x15, 0x55, 0xc5, 0x72, 0x4b, 0xc5, 0xc7, 0x7c, 0x62, 0xe6, 0xdb,
+	0x4a, 0x12, 0x5d, 0x85, 0x6c, 0x19, 0x3f, 0x79, 0xac, 0x4d, 0x58, 0x29, 0xca, 0x62, 0x56, 0xbd,
+	0x6f, 0x32, 0x87, 0x07, 0x3c, 0x50, 0x16, 0xb3, 0x3d, 0x61, 0xa5, 0x1f, 0x8e, 0x20, 0x51, 0x1e,
+	0xe8, 0xa6, 0x49, 0x86, 0xde, 0x50, 0x28, 0x2a, 0x74, 0x84, 0x9d, 0x1d, 0xf2, 0x11, 0xe4, 0x02,
+	0x41, 0xb3, 0x25, 0x96, 0xea, 0x14, 0x06, 0x0f, 0x99, 0x80, 0x57, 0x92, 0x5a, 0xa2, 0xf7, 0xbf,
+	0xb7, 0x80, 0x43, 0x01, 0x46, 0xc3, 0xcb, 0xca, 0x22, 0x9b, 0x2f, 0x63, 0x0f, 0x7b, 0xc0, 0xd3,
+	0x91, 0x75, 0xe6, 0x51, 0x92, 0x85, 0x94, 0xa2, 0x2a, 0x5e, 0xd0, 0xbc, 0x2f, 0x53, 0xd3, 0xef,
+	0x02, 0x1c, 0xb5, 0x32, 0x3b, 0x9e, 0x7b, 0xae, 0xfc, 0x59, 0x9b, 0x31, 0xa2, 0x9e, 0x6f, 0x36,
+	0xcf, 0x32, 0x46, 0xac, 0xf4, 0xb5, 0x93, 0xf7, 0xfa, 0xd6, 0x24, 0xe3, 0x05, 0xcb, 0xee, 0x3f,
+	0x0a, 0xfd, 0x43, 0xdc, 0x30, 0x7b, 0xb6, 0xfe, 0x88, 0xfd, 0xeb, 0xe4, 0x51, 0xdf, 0x0a, 0x49,
+	0x5e, 0xc4, 0x19, 0xf3, 0xdd, 0xff, 0x06, 0x00, 0x00, 0xff, 0xff, 0x4a, 0xb1, 0xdc, 0xc6, 0x3f,
+	0x1f, 0x00, 0x00,
 }
diff --git a/src/chromiumos/common.proto b/src/chromiumos/common.proto
index c3fd3e1..c6a756f 100644
--- a/src/chromiumos/common.proto
+++ b/src/chromiumos/common.proto
@@ -196,6 +196,23 @@
   bytes serialized_proto = 1;
 }
 
+// TODO(crbug/1019868): Consider migrating
+// chromite.api.toolchain.PrepareForToolchainBuildRequest as well.
+message PrepareForBuildResponse {
+  // Does this artifact require a build?
+  enum BuildRelevance {
+    UNSPECIFIED = 0;
+    // Build is necessary to generate artifacts.
+    NEEDED = 1;
+    // Defer to other artifacts.  Used primarily for aggregation of artifact
+    // results.
+    UNKNOWN = 2;
+    // Artifacts are already generated.  The build is pointless.
+    POINTLESS = 3;
+  }
+  BuildRelevance build_relevance = 1;
+}
+
 // TODO(crbug.com/1020615): Drop this from chromite/api/toolchain.proto (and
 // here) once usage has migrated to BuilderConfig.Artifacts.ArtifactType.
 // Meanwhile, keep this in sync with chromite/api/toolchain.proto.  The various