Propagate stub_only_libs to the invocation generating stub sources

In some cases the java_sdk_library needs to compile against hidden
platform APIs, in order to do so it needs to add impl_only_libs
dependency on the framework library, and set the sdk_version property to
the "core_*" one (e.g. core_platform).

However, if this java_sdk_library depends on the Android SDK in it's
stable API surface, then the setup above will break the stubs srcs
generation, as it uses the sdk_version of the java_sdk_library (e.g.
core_platform), which doesn't have symbols from the Android SDK.

This chage solves the problem by propagating the stub_only_libs to the
invocation that generates the stub sources. It allows the
java_sdk_libraries to add a stub_only_libs dependency on the
android_module_lib_stubs_current stubs library to fix their stubs build.

For more context see another change in this topic:
https://android-review.git.corp.google.com/c/platform/packages/modules/Virtualization/+/2310569

Bug: 243512044
Test: builds
Test: m nothing
Change-Id: Id745cfb2789901672561050c1c3f8bb163922379

java/sdk_library.go

@@ -1648,6 +1648,7 @@ func (module *SdkLibrary) createStubsSourcesAndApi(mctx android.DefaultableHookC
 	// shared libs and static libs. So we need to add both of these libs to Libs property.
 	props.Libs = module.properties.Libs
 	props.Libs = append(props.Libs, module.properties.Static_libs...)
+	props.Libs = append(props.Libs, module.sdkLibraryProperties.Stub_only_libs...)
 	props.Aidl.Include_dirs = module.deviceProperties.Aidl.Include_dirs
 	props.Aidl.Local_include_dirs = module.deviceProperties.Aidl.Local_include_dirs
 	props.Java_version = module.properties.Java_version

java/sdk_library_test.go

@@ -1385,3 +1385,29 @@ func TestSdkLibrary_CheckMinSdkVersion(t *testing.T) {
 			}
 		`)
 }
+
+func TestJavaSdkLibrary_StubOnlyLibs_PassedToDroidstubs(t *testing.T) {
+	result := android.GroupFixturePreparers(
+		prepareForJavaTest,
+		PrepareForTestWithJavaSdkLibraryFiles,
+		FixtureWithLastReleaseApis("foo"),
+	).RunTestWithBp(t, `
+		java_sdk_library {
+			name: "foo",
+			srcs: ["a.java"],
+			public: {
+				enabled: true,
+			},
+			stub_only_libs: ["bar-lib"],
+		}
+
+		java_library {
+			name: "bar-lib",
+			srcs: ["b.java"],
+		}
+		`)
+
+	// The foo.stubs.source should depend on bar-lib
+	fooStubsSources := result.ModuleForTests("foo.stubs.source", "android_common").Module().(*Droidstubs)
+	android.AssertStringListContains(t, "foo stubs should depend on bar-lib", fooStubsSources.Javadoc.properties.Libs, "bar-lib")
+}