Add SingletonContext::VisitDirectDepths[If] to Android proxy.

Adds the VisitDirectDepths[If] function from blueprint to the Android
SingletonContext proxy.

Bug: N/A
Test: N/A
Change-Id: I4037364ef11b545abc9a383db7e1e818854db68f
diff --git a/android/singleton.go b/android/singleton.go
index a59d54a..9b1fb57 100644
--- a/android/singleton.go
+++ b/android/singleton.go
@@ -52,6 +52,10 @@
 	VisitAllModulesBlueprint(visit func(blueprint.Module))
 	VisitAllModules(visit func(Module))
 	VisitAllModulesIf(pred func(Module) bool, visit func(Module))
+
+	VisitDirectDeps(module Module, visit func(Module))
+	VisitDirectDepsIf(module Module, pred func(Module) bool, visit func(Module))
+
 	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
 	VisitDepsDepthFirst(module Module, visit func(Module))
 	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
@@ -187,6 +191,14 @@
 	s.SingletonContext.VisitAllModulesIf(predAdaptor(pred), visitAdaptor(visit))
 }
 
+func (s *singletonContextAdaptor) VisitDirectDeps(module Module, visit func(Module)) {
+	s.SingletonContext.VisitDirectDeps(module, visitAdaptor(visit))
+}
+
+func (s *singletonContextAdaptor) VisitDirectDepsIf(module Module, pred func(Module) bool, visit func(Module)) {
+	s.SingletonContext.VisitDirectDepsIf(module, predAdaptor(pred), visitAdaptor(visit))
+}
+
 func (s *singletonContextAdaptor) VisitDepsDepthFirst(module Module, visit func(Module)) {
 	s.SingletonContext.VisitDepsDepthFirst(module, visitAdaptor(visit))
 }