Add preparer for overlay pre-singleton registration

It appears as though this is the first pre-singleton type to actually
be registered with the InitRegistrationContext as it failed due to an
uninitialized map, so this change also fixes that.

Bug: 182885307
Test: m nothing
Change-Id: Ibbf6d0db5f3c2fcc89291a16aa5f16b8b5009bd3

android/register.go

@@ -265,6 +265,7 @@ type RegistrationContext interface {
 var InitRegistrationContext RegistrationContext = &initRegistrationContext{
 	moduleTypes:       make(map[string]ModuleFactory),
 	singletonTypes:    make(map[string]SingletonFactory),
+	preSingletonTypes: make(map[string]SingletonFactory),
 }
 
 // Make sure the TestContext implements RegistrationContext.

java/android_resources.go

@@ -22,8 +22,11 @@ import (
 )
 
 func init() {
-	android.RegisterPreSingletonType("overlay", OverlaySingletonFactory)
+	registerOverlayBuildComponents(android.InitRegistrationContext)
+}
 
+func registerOverlayBuildComponents(ctx android.RegistrationContext) {
+	ctx.RegisterPreSingletonType("overlay", OverlaySingletonFactory)
 }
 
 var androidResourceIgnoreFilenames = []string{

java/java_test.go

@@ -71,11 +71,11 @@ var prepareForJavaTest = android.GroupFixturePreparers(
 	cc.PrepareForTestWithCcBuildComponents,
 	// Include all the default java modules.
 	PrepareForTestWithJavaDefaultModules,
+	PrepareForTestWithOverlayBuildComponents,
 	python.PrepareForTestWithPythonBuildComponents,
 	android.FixtureRegisterWithContext(func(ctx android.RegistrationContext) {
 		ctx.RegisterModuleType("java_plugin", PluginFactory)
 
-		ctx.RegisterPreSingletonType("overlay", OverlaySingletonFactory)
 		ctx.RegisterPreSingletonType("sdk_versions", sdkPreSingletonFactory)
 	}),
 	dexpreopt.PrepareForTestWithDexpreopt,

java/testing.go

@@ -54,6 +54,8 @@ var PrepareForTestWithJavaDefaultModules = android.GroupFixturePreparers(
 	android.FixtureAddTextFile(defaultJavaDir+"/Android.bp", GatherRequiredDepsForTest()),
 )
 
+var PrepareForTestWithOverlayBuildComponents = android.FixtureRegisterWithContext(registerOverlayBuildComponents)
+
 // Prepare a fixture to use all java module types, mutators and singletons fully.
 //
 // This should only be used by tests that want to run with as much of the build enabled as possible.