Merge "Create a "Toolchain" API surface"

android/sdk_version.go

@@ -51,6 +51,7 @@ const (
 	SdkModule
 	SdkSystemServer
 	SdkPrivate
+	SdkToolchain // API surface provided by ART to compile other API domains
 )
 
 // String returns the string representation of this SdkKind
@@ -76,6 +77,8 @@ func (k SdkKind) String() string {
 		return "module-lib"
 	case SdkSystemServer:
 		return "system-server"
+	case SdkToolchain:
+		return "toolchain"
 	default:
 		return "invalid"
 	}

java/droidstubs.go

@@ -877,6 +877,7 @@ var (
 		"module_lib":    android.SdkModule,
 		"module-lib":    android.SdkModule,
 		"test":          android.SdkTest,
+		"toolchain":     android.SdkToolchain,
 	}
 )