Stop java_sdk_library_import from depending on source modules

Previously, java_sdk_library_import added the dependencies on its child
components in the deps mutator after prebuilts without a matching
source module are renamed to the source module name. That meant that
the java_sdk_library_import has to use the source module name and ended
up depending on the source module unless it was preferred.

This change adds a new component deps mutator that runs before the
PrebuiltRenameMutator so that the java_sdk_library_import can add
dependencies onto the prebuilt modules. It also updates an affected
test.

Bug: 159902351
Test: m nothing
Change-Id: I3576c4873302743e51aff547ea1497bef6d748ac
diff --git a/android/module.go b/android/module.go
index 564c546..f80f37e 100644
--- a/android/module.go
+++ b/android/module.go
@@ -228,6 +228,16 @@
 	// For more information, see Module.GenerateBuildActions within Blueprint's module_ctx.go
 	GenerateAndroidBuildActions(ModuleContext)
 
+	// Add dependencies to the components of a module, i.e. modules that are created
+	// by the module and which are considered to be part of the creating module.
+	//
+	// This is called before prebuilts are renamed so as to allow a dependency to be
+	// added directly to a prebuilt child module instead of depending on a source module
+	// and relying on prebuilt processing to switch to the prebuilt module if preferred.
+	//
+	// A dependency on a prebuilt must include the "prebuilt_" prefix.
+	ComponentDepsMutator(ctx BottomUpMutatorContext)
+
 	DepsMutator(BottomUpMutatorContext)
 
 	base() *ModuleBase
@@ -769,6 +779,8 @@
 	prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool
 }
 
+func (m *ModuleBase) ComponentDepsMutator(BottomUpMutatorContext) {}
+
 func (m *ModuleBase) DepsMutator(BottomUpMutatorContext) {}
 
 func (m *ModuleBase) AddProperties(props ...interface{}) {
diff --git a/android/mutator.go b/android/mutator.go
index 77d5f43..9454485 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -115,6 +115,18 @@
 	// a DefaultableHook.
 	RegisterDefaultsPreArchMutators,
 
+	// Add dependencies on any components so that any component references can be
+	// resolved within the deps mutator.
+	//
+	// Must be run after defaults so it can be used to create dependencies on the
+	// component modules that are creating in a DefaultableHook.
+	//
+	// Must be run before RegisterPrebuiltsPreArchMutators, i.e. before prebuilts are
+	// renamed. That is so that if a module creates components using a prebuilt module
+	// type that any dependencies (which must use prebuilt_ prefixes) are resolved to
+	// the prebuilt module and not the source module.
+	RegisterComponentsMutator,
+
 	// Create an association between prebuilt modules and their corresponding source
 	// modules (if any).
 	//
@@ -252,8 +264,21 @@
 	return mutator
 }
 
+func RegisterComponentsMutator(ctx RegisterMutatorsContext) {
+	ctx.BottomUp("component-deps", componentDepsMutator).Parallel()
+}
+
+// A special mutator that runs just prior to the deps mutator to allow the dependencies
+// on component modules to be added so that they can depend directly on a prebuilt
+// module.
+func componentDepsMutator(ctx BottomUpMutatorContext) {
+	if m := ctx.Module(); m.Enabled() {
+		m.ComponentDepsMutator(ctx)
+	}
+}
+
 func depsMutator(ctx BottomUpMutatorContext) {
-	if m, ok := ctx.Module().(Module); ok && m.Enabled() {
+	if m := ctx.Module(); m.Enabled() {
 		m.DepsMutator(ctx)
 	}
 }