bootclasspath_fragment: Add test specific module type

This is needed to allow the behavior of the bootclasspath_fragment to
be tweaked for test fragments.

Bug: 194063708
Test: m nothing
Change-Id: Iee5c09d5b580d088ba081d95a788dbde883078ed

java/bootclasspath_fragment.go

@@ -42,6 +42,7 @@ func init() {
 
 func registerBootclasspathFragmentBuildComponents(ctx android.RegistrationContext) {
 	ctx.RegisterModuleType("bootclasspath_fragment", bootclasspathFragmentFactory)
+	ctx.RegisterModuleType("bootclasspath_fragment_test", testBootclasspathFragmentFactory)
 	ctx.RegisterModuleType("prebuilt_bootclasspath_fragment", prebuiltBootclasspathFragmentFactory)
 }
 
@@ -227,6 +228,9 @@ type BootclasspathFragmentModule struct {
 	android.SdkBase
 	ClasspathFragmentBase
 
+	// True if this fragment is for testing purposes.
+	testFragment bool
+
 	properties bootclasspathFragmentProperties
 
 	sourceOnlyProperties SourceOnlyBootclasspathProperties
@@ -298,6 +302,12 @@ func bootclasspathFragmentFactory() android.Module {
 	return m
 }
 
+func testBootclasspathFragmentFactory() android.Module {
+	m := bootclasspathFragmentFactory().(*BootclasspathFragmentModule)
+	m.testFragment = true
+	return m
+}
+
 // bootclasspathFragmentInitContentsFromImage will initialize the contents property from the image_name if
 // necessary.
 func bootclasspathFragmentInitContentsFromImage(ctx android.EarlyModuleContext, m *BootclasspathFragmentModule) {
@@ -815,6 +825,11 @@ func (b *BootclasspathFragmentModule) createHiddenAPIFlagInput(ctx android.Modul
 	return input
 }
 
+// isTestFragment returns true if the current module is a test bootclasspath_fragment.
+func (b *BootclasspathFragmentModule) isTestFragment() bool {
+	return b.testFragment
+}
+
 // produceHiddenAPIOutput produces the hidden API all-flags.csv file (and supporting files)
 // for the fragment as well as encoding the flags in the boot dex jars.
 func (b *BootclasspathFragmentModule) produceHiddenAPIOutput(ctx android.ModuleContext, contents []android.Module, input HiddenAPIFlagInput) *HiddenAPIOutput {