Deprecate chromiumos.PrepareForBuildResponse.

Begin migrating all of the users to chromite.api.(artifacts.)BuildRelevance.

BUG=chromium:1034529
TEST=generate

Change-Id: Iab5140437445e3de5da5d289dcdf503354f1413c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2172716
Tested-by: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
diff --git a/go/chromite/api/toolchain.pb.go b/go/chromite/api/toolchain.pb.go
index d6b2049..339483d 100644
--- a/go/chromite/api/toolchain.pb.go
+++ b/go/chromite/api/toolchain.pb.go
@@ -68,38 +68,40 @@
 }
 
 // Does this artifact require a build?
-type PrepareForToolchainBuildResponse_BuildRelevance int32
+// TODO(crbug/1034529): Once the users of this enum have moved to using
+// artifacts.PrepareForBuildResponse.${NAME}, remove this enum.
+type PrepareForToolchainBuildResponse_OldBuildRelevance int32
 
 const (
-	PrepareForToolchainBuildResponse_UNSPECIFIED PrepareForToolchainBuildResponse_BuildRelevance = 0
+	PrepareForToolchainBuildResponse_UNSPECIFIED PrepareForToolchainBuildResponse_OldBuildRelevance = 0
 	// Build is necessary to generate artifacts.
-	PrepareForToolchainBuildResponse_NEEDED PrepareForToolchainBuildResponse_BuildRelevance = 1
+	PrepareForToolchainBuildResponse_NEEDED PrepareForToolchainBuildResponse_OldBuildRelevance = 1
 	// Defer to other artifacts.  Used primarily for aggregation of artifact
 	// results.
-	PrepareForToolchainBuildResponse_UNKNOWN PrepareForToolchainBuildResponse_BuildRelevance = 2
+	PrepareForToolchainBuildResponse_UNKNOWN PrepareForToolchainBuildResponse_OldBuildRelevance = 2
 	// Artifacts are already generated.  The build is pointless.
-	PrepareForToolchainBuildResponse_POINTLESS PrepareForToolchainBuildResponse_BuildRelevance = 3
+	PrepareForToolchainBuildResponse_POINTLESS PrepareForToolchainBuildResponse_OldBuildRelevance = 3
 )
 
-var PrepareForToolchainBuildResponse_BuildRelevance_name = map[int32]string{
+var PrepareForToolchainBuildResponse_OldBuildRelevance_name = map[int32]string{
 	0: "UNSPECIFIED",
 	1: "NEEDED",
 	2: "UNKNOWN",
 	3: "POINTLESS",
 }
 
-var PrepareForToolchainBuildResponse_BuildRelevance_value = map[string]int32{
+var PrepareForToolchainBuildResponse_OldBuildRelevance_value = map[string]int32{
 	"UNSPECIFIED": 0,
 	"NEEDED":      1,
 	"UNKNOWN":     2,
 	"POINTLESS":   3,
 }
 
-func (x PrepareForToolchainBuildResponse_BuildRelevance) String() string {
-	return proto.EnumName(PrepareForToolchainBuildResponse_BuildRelevance_name, int32(x))
+func (x PrepareForToolchainBuildResponse_OldBuildRelevance) String() string {
+	return proto.EnumName(PrepareForToolchainBuildResponse_OldBuildRelevance_name, int32(x))
 }
 
-func (PrepareForToolchainBuildResponse_BuildRelevance) EnumDescriptor() ([]byte, []int) {
+func (PrepareForToolchainBuildResponse_OldBuildRelevance) EnumDescriptor() ([]byte, []int) {
 	return fileDescriptor_7ff43bdb7436d394, []int{2, 0}
 }
 
@@ -244,10 +246,11 @@
 
 // TODO(crbug/1019868): Migrate to using chromiumos.PrepareForBuildResponse.
 type PrepareForToolchainBuildResponse struct {
-	BuildRelevance       PrepareForToolchainBuildResponse_BuildRelevance `protobuf:"varint,1,opt,name=build_relevance,json=buildRelevance,proto3,enum=chromite.api.PrepareForToolchainBuildResponse_BuildRelevance" json:"build_relevance,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}                                        `json:"-"`
-	XXX_unrecognized     []byte                                          `json:"-"`
-	XXX_sizecache        int32                                           `json:"-"`
+	// See artifacts.proto in this directory.
+	BuildRelevance       PrepareForBuildResponse_BuildRelevance `protobuf:"varint,1,opt,name=build_relevance,json=buildRelevance,proto3,enum=chromite.api.PrepareForBuildResponse_BuildRelevance" json:"build_relevance,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                               `json:"-"`
+	XXX_unrecognized     []byte                                 `json:"-"`
+	XXX_sizecache        int32                                  `json:"-"`
 }
 
 func (m *PrepareForToolchainBuildResponse) Reset()         { *m = PrepareForToolchainBuildResponse{} }
@@ -275,11 +278,11 @@
 
 var xxx_messageInfo_PrepareForToolchainBuildResponse proto.InternalMessageInfo
 
-func (m *PrepareForToolchainBuildResponse) GetBuildRelevance() PrepareForToolchainBuildResponse_BuildRelevance {
+func (m *PrepareForToolchainBuildResponse) GetBuildRelevance() PrepareForBuildResponse_BuildRelevance {
 	if m != nil {
 		return m.BuildRelevance
 	}
-	return PrepareForToolchainBuildResponse_UNSPECIFIED
+	return PrepareForBuildResponse_UNSPECIFIED
 }
 
 type BundleToolchainRequest struct {
@@ -499,7 +502,7 @@
 
 func init() {
 	proto.RegisterEnum("chromite.api.AFDOArtifactType", AFDOArtifactType_name, AFDOArtifactType_value)
-	proto.RegisterEnum("chromite.api.PrepareForToolchainBuildResponse_BuildRelevance", PrepareForToolchainBuildResponse_BuildRelevance_name, PrepareForToolchainBuildResponse_BuildRelevance_value)
+	proto.RegisterEnum("chromite.api.PrepareForToolchainBuildResponse_OldBuildRelevance", PrepareForToolchainBuildResponse_OldBuildRelevance_name, PrepareForToolchainBuildResponse_OldBuildRelevance_value)
 	proto.RegisterType((*ArtifactInfo)(nil), "chromite.api.ArtifactInfo")
 	proto.RegisterType((*PrepareForToolchainBuildRequest)(nil), "chromite.api.PrepareForToolchainBuildRequest")
 	proto.RegisterType((*PrepareForToolchainBuildResponse)(nil), "chromite.api.PrepareForToolchainBuildResponse")
@@ -512,62 +515,62 @@
 func init() { proto.RegisterFile("chromite/api/toolchain.proto", fileDescriptor_7ff43bdb7436d394) }
 
 var fileDescriptor_7ff43bdb7436d394 = []byte{
-	// 866 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xcc, 0x56, 0xdd, 0x6e, 0x1b, 0x45,
-	0x14, 0xee, 0xae, 0x83, 0x5b, 0x1f, 0x3b, 0xf6, 0x32, 0x12, 0x89, 0x59, 0x5a, 0xc5, 0xb2, 0x40,
-	0x4a, 0x2b, 0x61, 0x8b, 0x40, 0x11, 0x42, 0xe2, 0xc2, 0x3f, 0x1b, 0xd5, 0x24, 0x5d, 0x5b, 0x63,
-	0x27, 0x05, 0x2e, 0xb0, 0xc6, 0xf6, 0xac, 0x33, 0x92, 0xb3, 0xb3, 0xcc, 0x8c, 0x2b, 0x22, 0x71,
-	0xcd, 0x4b, 0xc0, 0xd3, 0xf4, 0x09, 0xb8, 0xe1, 0x31, 0x2a, 0x5e, 0x01, 0xed, 0xce, 0xfe, 0xa6,
-	0xa9, 0x9a, 0x20, 0x84, 0xb8, 0xf3, 0xf9, 0x99, 0x73, 0xbe, 0xf9, 0xce, 0x37, 0xc7, 0x0b, 0x0f,
-	0x97, 0x17, 0x82, 0x5f, 0x32, 0x45, 0xbb, 0x24, 0x60, 0x5d, 0xc5, 0xf9, 0x66, 0x79, 0x41, 0x98,
-	0xdf, 0x09, 0x04, 0x57, 0x1c, 0xd5, 0x92, 0x68, 0x87, 0x04, 0xcc, 0x2e, 0xe6, 0x12, 0xa1, 0x98,
-	0x47, 0x96, 0x4a, 0xea, 0xdc, 0x6b, 0xd1, 0xc5, 0x96, 0x6d, 0x56, 0x73, 0x12, 0xb0, 0x38, 0x6a,
-	0x17, 0xa2, 0xf2, 0x4a, 0x0a, 0xce, 0x55, 0x1c, 0x3b, 0xd0, 0xb1, 0xed, 0x25, 0x97, 0xfa, 0x1c,
-	0x15, 0xf3, 0x25, 0xf7, 0x3d, 0xb6, 0x8e, 0x13, 0xf6, 0x73, 0x09, 0x4b, 0x7e, 0x79, 0xc9, 0x63,
-	0x7c, 0xed, 0xdf, 0x0d, 0xa8, 0xf5, 0x62, 0x1c, 0x23, 0xdf, 0xe3, 0xe8, 0x1c, 0x76, 0x13, 0x5c,
-	0x73, 0x75, 0x15, 0xd0, 0xa6, 0xd1, 0x32, 0x0e, 0xeb, 0x47, 0x9f, 0x75, 0xb2, 0x0a, 0x9d, 0xbe,
-	0x6e, 0x31, 0xd0, 0x1d, 0x7a, 0xe9, 0x35, 0x92, 0x5f, 0xb3, 0xab, 0x80, 0x4a, 0x5c, 0x23, 0x39,
-	0x13, 0x7d, 0x01, 0x95, 0xf4, 0xbe, 0x4d, 0xb3, 0x55, 0x3a, 0xac, 0x1e, 0xed, 0x75, 0xf2, 0xe4,
-	0xa4, 0xa7, 0x71, 0x96, 0xd8, 0xfe, 0xa3, 0x04, 0x07, 0x13, 0x41, 0x03, 0x22, 0xe8, 0x31, 0x17,
-	0xb3, 0x84, 0xdc, 0x08, 0x00, 0xa6, 0x3f, 0x6d, 0xa9, 0x54, 0xe8, 0x3b, 0xa8, 0x17, 0x10, 0xcb,
-	0xa6, 0xd1, 0x2a, 0xfd, 0x33, 0xc8, 0xbb, 0x79, 0xc8, 0x12, 0x3d, 0x81, 0x72, 0x58, 0x82, 0xab,
-	0xa6, 0xd9, 0x32, 0x0e, 0xab, 0x47, 0x28, 0x5f, 0x71, 0x10, 0x45, 0x70, 0x9c, 0x81, 0xba, 0x70,
-	0x3f, 0x9e, 0x49, 0xb3, 0x14, 0x25, 0x7f, 0x50, 0xbc, 0xdd, 0x54, 0x07, 0x71, 0x92, 0x85, 0x7e,
-	0x84, 0x06, 0xf3, 0x83, 0xad, 0x9a, 0x67, 0xb4, 0xec, 0x44, 0xb4, 0x3c, 0xbd, 0x0d, 0xee, 0x51,
-	0x78, 0x34, 0x3f, 0x38, 0x5c, 0x67, 0x79, 0x97, 0x44, 0x18, 0x1a, 0x64, 0xb5, 0x62, 0x8a, 0x71,
-	0x9f, 0x6c, 0xe6, 0x44, 0xac, 0x65, 0xf3, 0xbd, 0x08, 0xd8, 0xe3, 0x7c, 0xfd, 0x8c, 0xdc, 0xa8,
-	0x53, 0x2f, 0x3d, 0xd1, 0x13, 0x6b, 0x89, 0xeb, 0xa4, 0x60, 0xa3, 0x3e, 0xd4, 0x02, 0xc1, 0x3d,
-	0xb6, 0xa1, 0x73, 0xe6, 0x7b, 0xbc, 0x59, 0x8e, 0x0a, 0x1e, 0xe4, 0x0b, 0x26, 0x00, 0x26, 0x3a,
-	0x2f, 0x82, 0x56, 0x0d, 0x32, 0xa3, 0xfd, 0xa7, 0x01, 0xad, 0xb7, 0x8f, 0x54, 0x06, 0xdc, 0x97,
-	0x14, 0x79, 0xd0, 0xd0, 0xfa, 0x17, 0x74, 0x43, 0x5f, 0x12, 0x7f, 0x99, 0xe8, 0xf0, 0x9b, 0x22,
-	0xab, 0xef, 0x2a, 0xd4, 0x89, 0xad, 0xb8, 0x08, 0xae, 0x2f, 0x0a, 0x76, 0x7b, 0x04, 0xf5, 0x62,
-	0x06, 0x6a, 0x40, 0xf5, 0xcc, 0x9d, 0x4e, 0x9c, 0xc1, 0xe8, 0x78, 0xe4, 0x0c, 0xad, 0x7b, 0x08,
-	0xa0, 0xec, 0x3a, 0xce, 0xd0, 0x19, 0x5a, 0x06, 0xaa, 0xc2, 0xfd, 0x33, 0xf7, 0xc4, 0x1d, 0xbf,
-	0x70, 0x2d, 0x13, 0xed, 0x42, 0x65, 0x32, 0x1e, 0xb9, 0xb3, 0x53, 0x67, 0x3a, 0xb5, 0x4a, 0xed,
-	0x5f, 0x4b, 0xb0, 0xd7, 0xdf, 0xfa, 0xab, 0x0d, 0x4d, 0xa1, 0x24, 0x0a, 0xcd, 0x74, 0x64, 0xdc,
-	0x45, 0x47, 0xe6, 0xad, 0x74, 0xf4, 0x08, 0x80, 0x6f, 0x55, 0x28, 0xa4, 0x15, 0x13, 0x91, 0xf6,
-	0x2a, 0xb8, 0xa2, 0x3d, 0x43, 0x26, 0x6e, 0x78, 0x1d, 0x3b, 0xff, 0xd2, 0xeb, 0xf8, 0xbf, 0x0a,
-	0x6c, 0x01, 0xfb, 0x6f, 0xcc, 0x21, 0x96, 0x55, 0x2f, 0x23, 0x43, 0xea, 0x06, 0x7a, 0x13, 0xd9,
-	0x37, 0x6f, 0xa2, 0xa8, 0x76, 0x7a, 0x6b, 0x19, 0x9a, 0xdf, 0xee, 0x3c, 0x30, 0x2c, 0xb3, 0xfd,
-	0x9b, 0x01, 0xf6, 0x39, 0x15, 0xcc, 0xbb, 0xea, 0x1d, 0x0f, 0xc7, 0x29, 0x61, 0xc9, 0xc0, 0xbf,
-	0x86, 0x9a, 0x96, 0xaf, 0x22, 0x62, 0x4d, 0x93, 0xb1, 0xef, 0xbf, 0x41, 0xf9, 0x2c, 0x0a, 0xe3,
-	0xea, 0x22, 0x33, 0x50, 0xef, 0xfa, 0x02, 0x36, 0x23, 0xe1, 0x3f, 0x2c, 0x70, 0x90, 0x6b, 0x1a,
-	0x0e, 0xa3, 0xb8, 0x6b, 0xdb, 0x4f, 0xe1, 0xa3, 0x1b, 0xc1, 0xc5, 0x2c, 0xec, 0x41, 0x59, 0x2a,
-	0xa2, 0xb6, 0x32, 0xc2, 0xf5, 0x00, 0xc7, 0xd6, 0x13, 0x0f, 0xac, 0xeb, 0x85, 0x43, 0x91, 0xbb,
-	0x63, 0xd7, 0x99, 0xcf, 0xbe, 0x9f, 0x38, 0xd6, 0xbd, 0xd0, 0x1c, 0xe3, 0xa1, 0x83, 0x8f, 0x47,
-	0xa7, 0x8e, 0x65, 0x20, 0x04, 0xf5, 0xbe, 0xe3, 0x0e, 0x9e, 0x3d, 0xef, 0xe1, 0x93, 0x79, 0x78,
-	0xd6, 0x32, 0xc3, 0x07, 0x74, 0xe2, 0x60, 0xd7, 0x39, 0xd5, 0x8e, 0x52, 0xe8, 0x18, 0x3c, 0xc3,
-	0xe3, 0xe7, 0x8e, 0x76, 0xec, 0x1c, 0xfd, 0x55, 0x02, 0x2b, 0x9d, 0xcd, 0x94, 0x8a, 0x97, 0x6c,
-	0x49, 0xd1, 0x2f, 0xf0, 0xe8, 0x2c, 0x58, 0x11, 0x45, 0x9d, 0x88, 0x8c, 0x17, 0x4c, 0x5d, 0x14,
-	0xd0, 0xa3, 0xc3, 0xe2, 0x8c, 0xde, 0xce, 0xbe, 0xfd, 0xf8, 0x16, 0x99, 0x9a, 0x8a, 0x76, 0xf9,
-	0xd5, 0x6b, 0xdb, 0xb4, 0x0c, 0xf4, 0x33, 0x7c, 0x78, 0x16, 0x6c, 0x38, 0x59, 0x9d, 0x53, 0xa5,
-	0xe8, 0xea, 0x3f, 0xec, 0x1c, 0x40, 0xe3, 0xda, 0x13, 0x41, 0x9f, 0xde, 0x76, 0xc7, 0xe9, 0xa6,
-	0x9d, 0xbb, 0xad, 0xc4, 0xf0, 0x8f, 0x47, 0xbf, 0x8f, 0xec, 0x86, 0x1f, 0x17, 0x4b, 0xdc, 0xbc,
-	0xc6, 0xec, 0x4f, 0xde, 0x91, 0xa5, 0xeb, 0xdb, 0xef, 0xbf, 0x7a, 0x6d, 0xef, 0x42, 0x25, 0xfd,
-	0x12, 0xb2, 0xcc, 0xfe, 0x57, 0x3f, 0x7c, 0xb9, 0xe6, 0xa9, 0x80, 0x3b, 0x5c, 0xac, 0xbb, 0xb9,
-	0x0f, 0x12, 0xe6, 0x7b, 0x82, 0x74, 0xa3, 0xef, 0x91, 0xee, 0x9a, 0x77, 0xf3, 0xdf, 0x39, 0x8b,
-	0x72, 0xe4, 0xfe, 0xfc, 0xef, 0x00, 0x00, 0x00, 0xff, 0xff, 0x2c, 0x92, 0xf3, 0xf4, 0x66, 0x09,
-	0x00, 0x00,
+	// 873 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xcc, 0x56, 0xed, 0x6e, 0x1b, 0x45,
+	0x14, 0xed, 0xae, 0x83, 0x5b, 0x5f, 0x3b, 0xf6, 0x76, 0x24, 0x12, 0xb3, 0xb4, 0x8a, 0x65, 0x81,
+	0x94, 0x56, 0xc2, 0x16, 0xa1, 0x45, 0x88, 0x7f, 0xfe, 0xd8, 0xa8, 0x26, 0xe9, 0xda, 0x5a, 0x3b,
+	0x29, 0x20, 0x51, 0x6b, 0xec, 0x1d, 0x3b, 0x23, 0x39, 0x3b, 0xcb, 0xcc, 0xb8, 0x22, 0x12, 0xbf,
+	0x79, 0x09, 0x78, 0x9a, 0xbe, 0x00, 0xbc, 0x48, 0xc5, 0x2b, 0xa0, 0xdd, 0xd9, 0x4f, 0xc7, 0x11,
+	0x06, 0x21, 0xd4, 0x7f, 0xbe, 0x73, 0xcf, 0xbd, 0x73, 0xe6, 0xdc, 0x33, 0xe3, 0x85, 0x47, 0xf3,
+	0x2b, 0xce, 0xae, 0xa9, 0x24, 0x6d, 0xec, 0xd3, 0xb6, 0x64, 0x6c, 0x35, 0xbf, 0xc2, 0xd4, 0x6b,
+	0xf9, 0x9c, 0x49, 0x86, 0x2a, 0x71, 0xb6, 0x85, 0x7d, 0x6a, 0xe6, 0xb1, 0x98, 0x4b, 0xba, 0xc0,
+	0x73, 0x29, 0x14, 0x76, 0x23, 0x3b, 0x5b, 0xd3, 0x95, 0x3b, 0xc5, 0x3e, 0x8d, 0xb2, 0x66, 0x2e,
+	0x2b, 0x6e, 0x04, 0x67, 0x4c, 0x46, 0xb9, 0x23, 0x95, 0x5b, 0x5f, 0x33, 0xa1, 0xea, 0x08, 0x9f,
+	0xce, 0x99, 0xb7, 0xa0, 0xcb, 0x08, 0x70, 0x98, 0x01, 0xcc, 0xd9, 0xf5, 0x35, 0x8b, 0xf8, 0x35,
+	0x7f, 0xd3, 0xa0, 0xd2, 0x89, 0x78, 0x0c, 0xbc, 0x05, 0x43, 0x97, 0xb0, 0x1f, 0xf3, 0x9a, 0xca,
+	0x1b, 0x9f, 0xd4, 0xb5, 0x86, 0x76, 0x5c, 0x3d, 0xf9, 0xbc, 0x95, 0x76, 0x68, 0x75, 0xd5, 0x16,
+	0x3d, 0xb5, 0x43, 0x27, 0x39, 0x46, 0xfc, 0x6b, 0x72, 0xe3, 0x13, 0xe1, 0x54, 0x70, 0x26, 0x44,
+	0xcf, 0xa0, 0x94, 0x9c, 0xb7, 0xae, 0x37, 0x0a, 0xc7, 0xe5, 0x93, 0x83, 0x56, 0x56, 0x9c, 0xa4,
+	0xda, 0x49, 0x81, 0xcd, 0x3f, 0x0a, 0x70, 0x34, 0xe2, 0xc4, 0xc7, 0x9c, 0x9c, 0x32, 0x3e, 0x89,
+	0xc5, 0x0d, 0x09, 0x38, 0xe4, 0xc7, 0x35, 0x11, 0x12, 0x7d, 0x0b, 0xd5, 0x1c, 0x63, 0x51, 0xd7,
+	0x1a, 0x85, 0x7f, 0x47, 0x79, 0x3f, 0x4b, 0x59, 0xa0, 0xa7, 0x50, 0x0c, 0x5a, 0x30, 0x59, 0xd7,
+	0x1b, 0xda, 0x71, 0xf9, 0x04, 0x65, 0x3b, 0xf6, 0xc2, 0x8c, 0x13, 0x21, 0x50, 0x1b, 0xee, 0x47,
+	0x33, 0xa9, 0x17, 0x42, 0xf0, 0x87, 0xf9, 0xd3, 0x8d, 0x55, 0xd2, 0x89, 0x51, 0xe8, 0x35, 0xd4,
+	0xa8, 0xe7, 0xaf, 0xe5, 0x34, 0x95, 0x65, 0x2f, 0x94, 0xe5, 0xf9, 0x2e, 0xbc, 0x07, 0x41, 0x69,
+	0x76, 0x70, 0x4e, 0x95, 0x66, 0x97, 0x04, 0x72, 0xa0, 0x86, 0x5d, 0x97, 0x4a, 0xca, 0x3c, 0xbc,
+	0x9a, 0x62, 0xbe, 0x14, 0xf5, 0x0f, 0x42, 0x62, 0x4f, 0xb2, 0xfd, 0x53, 0x71, 0xc3, 0x9d, 0x3a,
+	0x49, 0x45, 0x87, 0x2f, 0x85, 0x53, 0xc5, 0xb9, 0x18, 0x75, 0xa1, 0xe2, 0x73, 0xb6, 0xa0, 0x2b,
+	0x32, 0xa5, 0xde, 0x82, 0xd5, 0x8b, 0x61, 0xc3, 0xa3, 0x6c, 0xc3, 0x98, 0xc0, 0x48, 0xe1, 0x42,
+	0x6a, 0x65, 0x3f, 0x0d, 0x9a, 0xbf, 0x6b, 0xd0, 0xb8, 0x7b, 0xa4, 0xc2, 0x67, 0x9e, 0x20, 0xe8,
+	0x07, 0xa8, 0x29, 0xff, 0x73, 0xb2, 0x22, 0x6f, 0xb0, 0x37, 0x8f, 0x7d, 0xf8, 0x2c, 0xaf, 0xea,
+	0x06, 0xfd, 0xb8, 0xbe, 0x15, 0x45, 0x51, 0xad, 0x53, 0x9d, 0xe5, 0xe2, 0xe6, 0x39, 0x3c, 0x1c,
+	0xae, 0xdc, 0x3c, 0x08, 0xd5, 0xa0, 0x7c, 0x61, 0x8f, 0x47, 0x56, 0x6f, 0x70, 0x3a, 0xb0, 0xfa,
+	0xc6, 0x3d, 0x04, 0x50, 0xb4, 0x2d, 0xab, 0x6f, 0xf5, 0x0d, 0x0d, 0x95, 0xe1, 0xfe, 0x85, 0x7d,
+	0x66, 0x0f, 0x5f, 0xd9, 0x86, 0x8e, 0xf6, 0xa1, 0x34, 0x1a, 0x0e, 0xec, 0xc9, 0xb9, 0x35, 0x1e,
+	0x1b, 0x85, 0xe6, 0x2f, 0x05, 0x38, 0xe8, 0xae, 0x3d, 0x77, 0x45, 0x92, 0xd3, 0xc4, 0xde, 0x4c,
+	0x1d, 0xa4, 0xfd, 0x13, 0x07, 0xe9, 0x3b, 0x39, 0xe8, 0x31, 0x00, 0x5b, 0xcb, 0xc0, 0x42, 0x2e,
+	0xe5, 0xa1, 0xeb, 0x4a, 0x4e, 0x49, 0xad, 0xf4, 0x29, 0xdf, 0x72, 0x2f, 0xf6, 0xfe, 0xa3, 0x7b,
+	0xf1, 0xbe, 0x5a, 0x6b, 0x06, 0x87, 0xb7, 0xe6, 0x10, 0x19, 0xaa, 0x93, 0x8a, 0x21, 0xd4, 0x06,
+	0xea, 0x0d, 0x32, 0xb7, 0xbf, 0x41, 0x61, 0xef, 0xe4, 0xd4, 0x22, 0x08, 0xbf, 0xd9, 0x7b, 0xa0,
+	0x19, 0x7a, 0xf3, 0x57, 0x0d, 0xcc, 0x4b, 0xc2, 0xe9, 0xe2, 0xa6, 0x73, 0xda, 0x1f, 0x26, 0x82,
+	0xc5, 0x03, 0xff, 0x1a, 0x2a, 0xca, 0xb8, 0x12, 0xf3, 0x25, 0x89, 0xc7, 0x7e, 0x78, 0x4b, 0xf2,
+	0x49, 0x98, 0x76, 0xca, 0xb3, 0x34, 0x40, 0x9d, 0xcd, 0xa7, 0x57, 0x0f, 0x2d, 0xff, 0x28, 0xa7,
+	0x41, 0x66, 0xd3, 0x60, 0x18, 0xf9, 0x57, 0xb6, 0xf9, 0x1c, 0x3e, 0xde, 0x4a, 0x2e, 0x52, 0xe1,
+	0x00, 0x8a, 0x42, 0x62, 0xb9, 0x16, 0x21, 0xaf, 0x07, 0x4e, 0x14, 0x3d, 0x5d, 0x80, 0xb1, 0xd9,
+	0x38, 0x30, 0xb9, 0x3d, 0xb4, 0xad, 0xe9, 0xe4, 0xbb, 0x91, 0x65, 0xdc, 0x0b, 0xc2, 0xa1, 0xd3,
+	0xb7, 0x9c, 0xd3, 0xc1, 0xb9, 0x65, 0x68, 0x08, 0x41, 0xb5, 0x6b, 0xd9, 0xbd, 0x17, 0x2f, 0x3b,
+	0xce, 0xd9, 0x34, 0xa8, 0x35, 0xf4, 0xe0, 0x02, 0x9d, 0x59, 0x8e, 0x6d, 0x9d, 0xab, 0x85, 0x42,
+	0xb0, 0xd0, 0x7b, 0xe1, 0x0c, 0x5f, 0x5a, 0x6a, 0x61, 0xef, 0xe4, 0xcf, 0x02, 0x18, 0xc9, 0x6c,
+	0xc6, 0x84, 0xbf, 0xa1, 0x73, 0x82, 0x7e, 0x86, 0xc7, 0x17, 0xbe, 0x8b, 0x25, 0xb1, 0x42, 0x31,
+	0x5e, 0x51, 0x79, 0x95, 0x63, 0x8f, 0x8e, 0xf3, 0x33, 0xba, 0x5b, 0x7d, 0xf3, 0xc9, 0x0e, 0x48,
+	0x25, 0x45, 0xb3, 0xf8, 0xf6, 0x9d, 0xa9, 0x1b, 0x1a, 0xfa, 0x09, 0x3e, 0xba, 0xf0, 0x57, 0x0c,
+	0xbb, 0x97, 0x44, 0x4a, 0xe2, 0xfe, 0x8f, 0x3b, 0xfb, 0x50, 0xdb, 0xb8, 0x22, 0xe8, 0xb3, 0xbb,
+	0x5e, 0xb7, 0xad, 0xff, 0x7c, 0x66, 0x6b, 0x57, 0x78, 0x34, 0xfe, 0xd7, 0x50, 0x53, 0xf7, 0x23,
+	0x3d, 0xe1, 0x27, 0xf9, 0x16, 0xdb, 0x9f, 0x31, 0xf3, 0xd3, 0xbf, 0x41, 0xa9, 0xfe, 0xe6, 0xc3,
+	0xb7, 0xef, 0xcc, 0x7d, 0x28, 0x25, 0xdf, 0x40, 0x86, 0xde, 0xfd, 0xea, 0xfb, 0x2f, 0x97, 0x2c,
+	0x31, 0x70, 0x8b, 0xf1, 0x65, 0x3b, 0xf3, 0x29, 0x42, 0xbd, 0x05, 0xc7, 0xed, 0xf0, 0x4b, 0xa4,
+	0xbd, 0x64, 0xed, 0xec, 0x17, 0xce, 0xac, 0x18, 0x2e, 0x7f, 0xf1, 0x57, 0x00, 0x00, 0x00, 0xff,
+	0xff, 0x5c, 0xf1, 0xa9, 0x64, 0x60, 0x09, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/go/chromiumos/common.pb.go b/go/chromiumos/common.pb.go
index 081c486..5b391e4 100644
--- a/go/chromiumos/common.pb.go
+++ b/go/chromiumos/common.pb.go
@@ -218,7 +218,7 @@
 	return fileDescriptor_fa0b57c3d7d4c63b, []int{6, 0}
 }
 
-// Does this artifact require a build?
+// DEPRECTATED: Does this artifact require a build?
 type PrepareForBuildResponse_BuildRelevance int32
 
 const (
@@ -1276,8 +1276,8 @@
 	return nil
 }
 
-// TODO(crbug/1019868): Consider migrating
-// chromite.api.toolchain.PrepareForToolchainBuildRequest as well.
+// TODO(crbug/1034529): Remove this after migrating users to
+// chromite.api.artifacts.PrepareForBuildResponse.
 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:"-"`
diff --git a/src/chromite/api/toolchain.proto b/src/chromite/api/toolchain.proto
index 83c0914..dad8fdf 100644
--- a/src/chromite/api/toolchain.proto
+++ b/src/chromite/api/toolchain.proto
@@ -46,7 +46,9 @@
 // TODO(crbug/1019868): Migrate to using chromiumos.PrepareForBuildResponse.
 message PrepareForToolchainBuildResponse {
   // Does this artifact require a build?
-  enum BuildRelevance {
+  // TODO(crbug/1034529): Once the users of this enum have moved to using
+  // artifacts.PrepareForBuildResponse.${NAME}, remove this enum.
+  enum OldBuildRelevance {
     UNSPECIFIED = 0;
     // Build is necessary to generate artifacts.
     NEEDED = 1;
@@ -56,7 +58,8 @@
     // Artifacts are already generated.  The build is pointless.
     POINTLESS = 3;
   }
-  BuildRelevance build_relevance = 1;
+  // See artifacts.proto in this directory.
+  PrepareForBuildResponse.BuildRelevance build_relevance = 1;
 }
 
 message BundleToolchainRequest {
diff --git a/src/chromiumos/common.proto b/src/chromiumos/common.proto
index c6a756f..2bb1fa4 100644
--- a/src/chromiumos/common.proto
+++ b/src/chromiumos/common.proto
@@ -196,10 +196,10 @@
   bytes serialized_proto = 1;
 }
 
-// TODO(crbug/1019868): Consider migrating
-// chromite.api.toolchain.PrepareForToolchainBuildRequest as well.
+// TODO(crbug/1034529): Remove this after migrating users to
+// chromite.api.artifacts.PrepareForBuildResponse.
 message PrepareForBuildResponse {
-  // Does this artifact require a build?
+  // DEPRECTATED: Does this artifact require a build?
   enum BuildRelevance {
     UNSPECIFIED = 0;
     // Build is necessary to generate artifacts.