Multi-tree API bp2build converter for ndk_library

This is a partial bp2build conversion that only emits the
cc_api_contribution target of ndk_library. We also need to convert this
to cc_stub_suite eventually to enable building vendor/product API
domains with Bazel

Also create an enum for the three known Multi-tree API surfaces (will
likely be expanded in the future)

Test: go test ./bp2build
Test: b cquery //bionic/libc:libc.ndk.contribution --output=starlark
--starlark:expr="providers(target)"

Change-Id: Idb24871ba20aae132b61eb31ef35c917cacae9e1

1 files changed, 22 insertions, 0 deletions

diff --git a/android/api_domain.go b/android/api_domain.go
index a808e3260..8ff475287 100644
--- a/android/api_domain.go
+++ b/android/api_domain.go
@@ -28,6 +28,28 @@ func RegisterApiDomainBuildComponents(ctx RegistrationContext) {
 	ctx.RegisterModuleType("api_domain", ApiDomainFactory)
 }
 
+type ApiSurface int
+
+// TODO(b/246656800): Reconcile with android.SdkKind
+const (
+	PublicApi ApiSurface = iota
+	SystemApi
+	VendorApi
+)
+
+func (a ApiSurface) String() string {
+	switch a {
+	case PublicApi:
+		return "publicapi"
+	case SystemApi:
+		return "systemapi"
+	case VendorApi:
+		return "vendorapi"
+	default:
+		return "invalid"
+	}
+}
+
 type apiDomain struct {
 	ModuleBase
 	BazelModuleBase