toolchain: prepare_for_build additional_args

Certain toolchain artifacts require additional information to generate
and verify the artifact.

BUG=chromium:1019868
TEST=generate

Change-Id: I1c13dd43f4552b0c68bc127bc34b4d8a83223baa
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2048023
Tested-by: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
diff --git a/descpb.bin b/descpb.bin
index dbb0258..f40359e 100644
--- a/descpb.bin
+++ b/descpb.bin
Binary files differ
diff --git a/go/chromite/api/toolchain.pb.go b/go/chromite/api/toolchain.pb.go
index 96b793d..6cdc92a 100644
--- a/go/chromite/api/toolchain.pb.go
+++ b/go/chromite/api/toolchain.pb.go
@@ -164,10 +164,12 @@
 	// The sysroot where the files live.
 	Sysroot *Sysroot `protobuf:"bytes,3,opt,name=sysroot,proto3" json:"sysroot,omitempty"`
 	// Information about artifacts available when preparing.
-	InputArtifacts       []*chromiumos.BuilderConfig_Artifacts_InputArtifactInfo `protobuf:"bytes,4,rep,name=input_artifacts,json=inputArtifacts,proto3" json:"input_artifacts,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}                                                `json:"-"`
-	XXX_unrecognized     []byte                                                  `json:"-"`
-	XXX_sizecache        int32                                                   `json:"-"`
+	InputArtifacts []*chromiumos.BuilderConfig_Artifacts_InputArtifactInfo `protobuf:"bytes,4,rep,name=input_artifacts,json=inputArtifacts,proto3" json:"input_artifacts,omitempty"`
+	// Additional arguments used in PrepareForBuild.
+	AdditionalArgs       *chromiumos.PrepareForBuildAdditionalArgs `protobuf:"bytes,5,opt,name=additional_args,json=additionalArgs,proto3" json:"additional_args,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                                  `json:"-"`
+	XXX_unrecognized     []byte                                    `json:"-"`
+	XXX_sizecache        int32                                     `json:"-"`
 }
 
 func (m *PrepareForToolchainBuildRequest) Reset()         { *m = PrepareForToolchainBuildRequest{} }
@@ -223,6 +225,13 @@
 	return nil
 }
 
+func (m *PrepareForToolchainBuildRequest) GetAdditionalArgs() *chromiumos.PrepareForBuildAdditionalArgs {
+	if m != nil {
+		return m.AdditionalArgs
+	}
+	return nil
+}
+
 // 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"`
@@ -474,57 +483,60 @@
 func init() { proto.RegisterFile("chromite/api/toolchain.proto", fileDescriptor_7ff43bdb7436d394) }
 
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+	0x08, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/go/chromiumos/builder_config.pb.go b/go/chromiumos/builder_config.pb.go
index bdf8c0a..54bdb8d 100644
--- a/go/chromiumos/builder_config.pb.go
+++ b/go/chromiumos/builder_config.pb.go
@@ -1061,6 +1061,7 @@
 	// Whether to apply gerrit changes, if any. Use case is to build without
 	// changes after failure to identify the changes as the culprit.
 	ApplyGerritChanges   bool                                  `protobuf:"varint,6,opt,name=apply_gerrit_changes,json=applyGerritChanges,proto3" json:"apply_gerrit_changes,omitempty"`
+	PrepareForBuild      *BuilderConfig_Build_PrepareForBuild  `protobuf:"bytes,17,opt,name=prepare_for_build,json=prepareForBuild,proto3" json:"prepare_for_build,omitempty"`
 	SdkUpdate            *BuilderConfig_Build_SdkUpdate        `protobuf:"bytes,12,opt,name=sdk_update,json=sdkUpdate,proto3" json:"sdk_update,omitempty"`
 	InstallToolchain     *BuilderConfig_Build_InstallToolchain `protobuf:"bytes,13,opt,name=install_toolchain,json=installToolchain,proto3" json:"install_toolchain,omitempty"`
 	InstallPackages      *BuilderConfig_Build_InstallPackages  `protobuf:"bytes,16,opt,name=install_packages,json=installPackages,proto3" json:"install_packages,omitempty"`
@@ -1116,6 +1117,13 @@
 	return false
 }
 
+func (m *BuilderConfig_Build) GetPrepareForBuild() *BuilderConfig_Build_PrepareForBuild {
+	if m != nil {
+		return m.PrepareForBuild
+	}
+	return nil
+}
+
 func (m *BuilderConfig_Build) GetSdkUpdate() *BuilderConfig_Build_SdkUpdate {
 	if m != nil {
 		return m.SdkUpdate
@@ -1184,6 +1192,48 @@
 	return ""
 }
 
+// Controls for the call to cros_artifacts.prepare_for_build.
+type BuilderConfig_Build_PrepareForBuild struct {
+	// Additional arguments from common.proto, passed into any
+	// PrepareFor*Build endpoint.
+	AdditionalArgs       *PrepareForBuildAdditionalArgs `protobuf:"bytes,1,opt,name=additional_args,json=additionalArgs,proto3" json:"additional_args,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                       `json:"-"`
+	XXX_unrecognized     []byte                         `json:"-"`
+	XXX_sizecache        int32                          `json:"-"`
+}
+
+func (m *BuilderConfig_Build_PrepareForBuild) Reset()         { *m = BuilderConfig_Build_PrepareForBuild{} }
+func (m *BuilderConfig_Build_PrepareForBuild) String() string { return proto.CompactTextString(m) }
+func (*BuilderConfig_Build_PrepareForBuild) ProtoMessage()    {}
+func (*BuilderConfig_Build_PrepareForBuild) Descriptor() ([]byte, []int) {
+	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 1}
+}
+
+func (m *BuilderConfig_Build_PrepareForBuild) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BuilderConfig_Build_PrepareForBuild.Unmarshal(m, b)
+}
+func (m *BuilderConfig_Build_PrepareForBuild) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BuilderConfig_Build_PrepareForBuild.Marshal(b, m, deterministic)
+}
+func (m *BuilderConfig_Build_PrepareForBuild) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BuilderConfig_Build_PrepareForBuild.Merge(m, src)
+}
+func (m *BuilderConfig_Build_PrepareForBuild) XXX_Size() int {
+	return xxx_messageInfo_BuilderConfig_Build_PrepareForBuild.Size(m)
+}
+func (m *BuilderConfig_Build_PrepareForBuild) XXX_DiscardUnknown() {
+	xxx_messageInfo_BuilderConfig_Build_PrepareForBuild.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BuilderConfig_Build_PrepareForBuild proto.InternalMessageInfo
+
+func (m *BuilderConfig_Build_PrepareForBuild) GetAdditionalArgs() *PrepareForBuildAdditionalArgs {
+	if m != nil {
+		return m.AdditionalArgs
+	}
+	return nil
+}
+
 // Controls for the call to SdkService.Update.
 type BuilderConfig_Build_SdkUpdate struct {
 	// Whether to compile from source (vs using prebuilts when able.)
@@ -1197,7 +1247,7 @@
 func (m *BuilderConfig_Build_SdkUpdate) String() string { return proto.CompactTextString(m) }
 func (*BuilderConfig_Build_SdkUpdate) ProtoMessage()    {}
 func (*BuilderConfig_Build_SdkUpdate) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 1}
+	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 2}
 }
 
 func (m *BuilderConfig_Build_SdkUpdate) XXX_Unmarshal(b []byte) error {
@@ -1238,7 +1288,7 @@
 func (m *BuilderConfig_Build_InstallToolchain) String() string { return proto.CompactTextString(m) }
 func (*BuilderConfig_Build_InstallToolchain) ProtoMessage()    {}
 func (*BuilderConfig_Build_InstallToolchain) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 2}
+	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 3}
 }
 
 func (m *BuilderConfig_Build_InstallToolchain) XXX_Unmarshal(b []byte) error {
@@ -1286,7 +1336,7 @@
 func (m *BuilderConfig_Build_InstallPackages) String() string { return proto.CompactTextString(m) }
 func (*BuilderConfig_Build_InstallPackages) ProtoMessage()    {}
 func (*BuilderConfig_Build_InstallPackages) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 3}
+	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 4}
 }
 
 func (m *BuilderConfig_Build_InstallPackages) XXX_Unmarshal(b []byte) error {
@@ -1347,7 +1397,7 @@
 func (m *BuilderConfig_Build_BuildImages) String() string { return proto.CompactTextString(m) }
 func (*BuilderConfig_Build_BuildImages) ProtoMessage()    {}
 func (*BuilderConfig_Build_BuildImages) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 4}
+	return fileDescriptor_6fe67302c16003fb, []int{0, 5, 5}
 }
 
 func (m *BuilderConfig_Build_BuildImages) XXX_Unmarshal(b []byte) error {
@@ -1494,6 +1544,7 @@
 	proto.RegisterType((*BuilderConfig_Chrome)(nil), "chromiumos.BuilderConfig.Chrome")
 	proto.RegisterType((*BuilderConfig_Build)(nil), "chromiumos.BuilderConfig.Build")
 	proto.RegisterType((*BuilderConfig_Build_PortageProfile)(nil), "chromiumos.BuilderConfig.Build.PortageProfile")
+	proto.RegisterType((*BuilderConfig_Build_PrepareForBuild)(nil), "chromiumos.BuilderConfig.Build.PrepareForBuild")
 	proto.RegisterType((*BuilderConfig_Build_SdkUpdate)(nil), "chromiumos.BuilderConfig.Build.SdkUpdate")
 	proto.RegisterType((*BuilderConfig_Build_InstallToolchain)(nil), "chromiumos.BuilderConfig.Build.InstallToolchain")
 	proto.RegisterType((*BuilderConfig_Build_InstallPackages)(nil), "chromiumos.BuilderConfig.Build.InstallPackages")
@@ -1505,135 +1556,139 @@
 func init() { proto.RegisterFile("chromiumos/builder_config.proto", fileDescriptor_6fe67302c16003fb) }
 
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 }
diff --git a/go/chromiumos/common.pb.go b/go/chromiumos/common.pb.go
index 333b482..9286c57 100644
--- a/go/chromiumos/common.pb.go
+++ b/go/chromiumos/common.pb.go
@@ -1076,6 +1076,89 @@
 	return PrepareForBuildResponse_UNSPECIFIED
 }
 
+// Additional information about artifacts used by PrepareForBuild endpoints.
+type PrepareForBuildAdditionalArgs struct {
+	// Types that are valid to be assigned to PrepareForBuildArgs:
+	//	*PrepareForBuildAdditionalArgs_ChromeCwpProfile
+	//	*PrepareForBuildAdditionalArgs_KernelVersion
+	PrepareForBuildArgs  isPrepareForBuildAdditionalArgs_PrepareForBuildArgs `protobuf_oneof:"prepare_for_build_args"`
+	XXX_NoUnkeyedLiteral struct{}                                            `json:"-"`
+	XXX_unrecognized     []byte                                              `json:"-"`
+	XXX_sizecache        int32                                               `json:"-"`
+}
+
+func (m *PrepareForBuildAdditionalArgs) Reset()         { *m = PrepareForBuildAdditionalArgs{} }
+func (m *PrepareForBuildAdditionalArgs) String() string { return proto.CompactTextString(m) }
+func (*PrepareForBuildAdditionalArgs) ProtoMessage()    {}
+func (*PrepareForBuildAdditionalArgs) Descriptor() ([]byte, []int) {
+	return fileDescriptor_fa0b57c3d7d4c63b, []int{14}
+}
+
+func (m *PrepareForBuildAdditionalArgs) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_PrepareForBuildAdditionalArgs.Unmarshal(m, b)
+}
+func (m *PrepareForBuildAdditionalArgs) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_PrepareForBuildAdditionalArgs.Marshal(b, m, deterministic)
+}
+func (m *PrepareForBuildAdditionalArgs) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_PrepareForBuildAdditionalArgs.Merge(m, src)
+}
+func (m *PrepareForBuildAdditionalArgs) XXX_Size() int {
+	return xxx_messageInfo_PrepareForBuildAdditionalArgs.Size(m)
+}
+func (m *PrepareForBuildAdditionalArgs) XXX_DiscardUnknown() {
+	xxx_messageInfo_PrepareForBuildAdditionalArgs.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_PrepareForBuildAdditionalArgs proto.InternalMessageInfo
+
+type isPrepareForBuildAdditionalArgs_PrepareForBuildArgs interface {
+	isPrepareForBuildAdditionalArgs_PrepareForBuildArgs()
+}
+
+type PrepareForBuildAdditionalArgs_ChromeCwpProfile struct {
+	ChromeCwpProfile string `protobuf:"bytes,1,opt,name=chrome_cwp_profile,json=chromeCwpProfile,proto3,oneof"`
+}
+
+type PrepareForBuildAdditionalArgs_KernelVersion struct {
+	KernelVersion string `protobuf:"bytes,2,opt,name=kernel_version,json=kernelVersion,proto3,oneof"`
+}
+
+func (*PrepareForBuildAdditionalArgs_ChromeCwpProfile) isPrepareForBuildAdditionalArgs_PrepareForBuildArgs() {
+}
+
+func (*PrepareForBuildAdditionalArgs_KernelVersion) isPrepareForBuildAdditionalArgs_PrepareForBuildArgs() {
+}
+
+func (m *PrepareForBuildAdditionalArgs) GetPrepareForBuildArgs() isPrepareForBuildAdditionalArgs_PrepareForBuildArgs {
+	if m != nil {
+		return m.PrepareForBuildArgs
+	}
+	return nil
+}
+
+func (m *PrepareForBuildAdditionalArgs) GetChromeCwpProfile() string {
+	if x, ok := m.GetPrepareForBuildArgs().(*PrepareForBuildAdditionalArgs_ChromeCwpProfile); ok {
+		return x.ChromeCwpProfile
+	}
+	return ""
+}
+
+func (m *PrepareForBuildAdditionalArgs) GetKernelVersion() string {
+	if x, ok := m.GetPrepareForBuildArgs().(*PrepareForBuildAdditionalArgs_KernelVersion); ok {
+		return x.KernelVersion
+	}
+	return ""
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*PrepareForBuildAdditionalArgs) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*PrepareForBuildAdditionalArgs_ChromeCwpProfile)(nil),
+		(*PrepareForBuildAdditionalArgs_KernelVersion)(nil),
+	}
+}
+
 func init() {
 	proto.RegisterEnum("chromiumos.ImageType", ImageType_name, ImageType_value)
 	proto.RegisterEnum("chromiumos.Channel", Channel_name, Channel_value)
@@ -1098,83 +1181,89 @@
 	proto.RegisterType((*UseFlag)(nil), "chromiumos.UseFlag")
 	proto.RegisterType((*ProtoBytes)(nil), "chromiumos.ProtoBytes")
 	proto.RegisterType((*PrepareForBuildResponse)(nil), "chromiumos.PrepareForBuildResponse")
+	proto.RegisterType((*PrepareForBuildAdditionalArgs)(nil), "chromiumos.PrepareForBuildAdditionalArgs")
 }
 
 func init() { proto.RegisterFile("chromiumos/common.proto", fileDescriptor_fa0b57c3d7d4c63b) }
 
 var fileDescriptor_fa0b57c3d7d4c63b = []byte{
-	// 1163 bytes of a gzipped FileDescriptorProto
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+	0xac, 0x59, 0xd0, 0xb9, 0xab, 0x21, 0xda, 0xe9, 0xee, 0x14, 0x03, 0x54, 0x6d, 0xd3, 0x1c, 0x9a,
+	0xc3, 0xac, 0x9d, 0xe6, 0xf6, 0x5b, 0xdb, 0x79, 0x67, 0xab, 0x65, 0xd4, 0x86, 0xc6, 0xc4, 0xb1,
+	0xec, 0xd9, 0x85, 0x39, 0x9d, 0xaa, 0x8a, 0xf6, 0x5b, 0x09, 0x8e, 0xee, 0x45, 0xa1, 0x2f, 0x16,
+	0xb2, 0x6e, 0x24, 0xd4, 0xb9, 0x9f, 0xa0, 0x1e, 0xa0, 0xfc, 0xb3, 0xe1, 0x7d, 0x8a, 0x45, 0x41,
+	0x76, 0xa3, 0x7d, 0x7e, 0x80, 0xd5, 0x8c, 0x33, 0x3e, 0xc5, 0x93, 0x8c, 0x41, 0xdf, 0x42, 0xe7,
+	0x23, 0xe5, 0x11, 0x0d, 0xdd, 0x62, 0xb4, 0xca, 0xb9, 0x6e, 0x3b, 0xc3, 0xaf, 0x32, 0x78, 0xd0,
+	0x85, 0xc7, 0x71, 0xe6, 0xd9, 0x5d, 0x32, 0xee, 0x66, 0xe5, 0x22, 0xdc, 0x4f, 0x4e, 0xff, 0x28,
+	0x41, 0xc3, 0x5a, 0x13, 0x9f, 0xce, 0x6e, 0x63, 0xf1, 0x5d, 0xf8, 0x8f, 0x75, 0xa9, 0x8f, 0x4d,
+	0x77, 0x76, 0x3d, 0x31, 0xdd, 0xb9, 0x3d, 0x34, 0x47, 0x96, 0x2d, 0x93, 0xac, 0x43, 0x65, 0xa0,
+	0x4f, 0xc5, 0xc4, 0xd4, 0x40, 0x19, 0x9a, 0x57, 0x6a, 0x59, 0x40, 0x33, 0x73, 0x3a, 0x53, 0x15,
+	0x91, 0xb5, 0x20, 0xdd, 0xab, 0x4b, 0xb5, 0x22, 0x04, 0x01, 0x0b, 0xe1, 0x81, 0x5c, 0x6a, 0xa6,
+	0xe1, 0x5c, 0x99, 0xf8, 0x5a, 0xad, 0x0a, 0x6a, 0xa4, 0x1b, 0x33, 0x07, 0x5f, 0xab, 0x35, 0x41,
+	0x8d, 0x2c, 0x7c, 0xf9, 0x4e, 0xc7, 0xa6, 0x5a, 0x47, 0x0f, 0xa1, 0x6d, 0xe0, 0xd7, 0x2f, 0xdd,
+	0x2d, 0xd4, 0x10, 0x90, 0xb4, 0x3a, 0x9e, 0xe7, 0xe6, 0x40, 0x40, 0xd2, 0xf6, 0x16, 0x6a, 0x9e,
+	0xae, 0xa1, 0x26, 0x46, 0x2b, 0xa2, 0x21, 0x7a, 0x02, 0x8f, 0x8c, 0x73, 0xdd, 0xb6, 0xcd, 0x8b,
+	0x7b, 0x7b, 0x16, 0x41, 0xa7, 0x20, 0xa6, 0x33, 0x7d, 0x70, 0x21, 0xd2, 0x50, 0xa1, 0x55, 0x60,
+	0x03, 0x73, 0xa6, 0x67, 0x2b, 0xb7, 0x40, 0x44, 0x82, 0xca, 0xfe, 0x35, 0x43, 0xb7, 0x75, 0x7c,
+	0xad, 0x56, 0x4e, 0x97, 0xa0, 0xea, 0xa3, 0xa1, 0x53, 0xac, 0x61, 0x59, 0xb5, 0x36, 0x34, 0x6c,
+	0xc7, 0xce, 0x8a, 0xa6, 0x1e, 0x08, 0xd1, 0xc1, 0x43, 0x13, 0x8f, 0x2c, 0xe9, 0x08, 0x41, 0x67,
+	0x60, 0xda, 0xc6, 0xf9, 0xa5, 0x8e, 0xdf, 0xba, 0xe2, 0x6e, 0xe6, 0xea, 0xad, 0x89, 0x85, 0x61,
+	0x09, 0x28, 0x99, 0x6f, 0xec, 0x5c, 0x9a, 0x19, 0x50, 0x19, 0xfc, 0xf0, 0xd3, 0x2b, 0x9f, 0x6d,
+	0xfb, 0xb7, 0xc7, 0xb8, 0x7f, 0xb6, 0xf7, 0x3f, 0x28, 0x88, 0x96, 0x9c, 0x9c, 0xc9, 0x89, 0x39,
+	0xf3, 0xd9, 0x1e, 0xf3, 0xbe, 0x2a, 0xc1, 0xef, 0xff, 0x0e, 0x00, 0x00, 0xff, 0xff, 0xde, 0x7e,
+	0x35, 0xf6, 0x36, 0x09, 0x00, 0x00,
 }
diff --git a/src/chromite/api/toolchain.proto b/src/chromite/api/toolchain.proto
index fcc6541..aa98179 100644
--- a/src/chromite/api/toolchain.proto
+++ b/src/chromite/api/toolchain.proto
@@ -34,6 +34,9 @@
 
   // Information about artifacts available when preparing.
   repeated chromiumos.BuilderConfig.Artifacts.InputArtifactInfo input_artifacts = 4;
+
+  // Additional arguments used in PrepareForBuild.
+  chromiumos.PrepareForBuildAdditionalArgs additional_args = 5;
 }
 
 // TODO(crbug/1019868): Migrate to using chromiumos.PrepareForBuildResponse.
@@ -67,7 +70,6 @@
 
 // Response describing which bundles were dumped to the given output directory.
 message BundleToolchainResponse {
-
   reserved 1;
 
   // The artifacts that added to the output directory.
diff --git a/src/chromiumos/builder_config.proto b/src/chromiumos/builder_config.proto
index 05d286c..3c51bb4 100644
--- a/src/chromiumos/builder_config.proto
+++ b/src/chromiumos/builder_config.proto
@@ -302,7 +302,16 @@
     reserved 7 to 11;
 
     // Below here are configuration specifications for the steps that call the
-    // Build API endpoints.
+    // Build API endpoints.  They are listed in the order in which steps are
+    // generally called, rather than in numerical order.
+
+    // Controls for the call to cros_artifacts.prepare_for_build.
+    message PrepareForBuild {
+      // Additional arguments from common.proto, passed into any
+      // PrepareFor*Build endpoint.
+      PrepareForBuildAdditionalArgs additional_args = 1;
+    }
+    PrepareForBuild prepare_for_build = 17;
 
     // Controls for the call to SdkService.Update.
     message SdkUpdate {
diff --git a/src/chromiumos/common.proto b/src/chromiumos/common.proto
index e82a60b..c4c3653 100644
--- a/src/chromiumos/common.proto
+++ b/src/chromiumos/common.proto
@@ -233,3 +233,14 @@
   // The type is Chrome AFDO used in release builders.
   CHROME_AFDO = 4;
 }
+
+// Additional information about artifacts used by PrepareForBuild endpoints.
+message PrepareForBuildAdditionalArgs {
+  oneof prepare_for_build_args {
+    // ToolchainService Chrome AFDO artifacts require profile name.
+    string chrome_cwp_profile = 1;
+
+    // ToolchainService Kernel AFDO artifacts require a kernel version.
+    string kernel_version = 2;
+  }
+}