android: Use UIResource for overscroll glow

ui/base/android/window_android.cc

Index: ui/base/android/window_android.cc
diff --git a/ui/base/android/window_android.cc b/ui/base/android/window_android.cc
index 490c6f3b545f2adfaabf67d3e4efb2766fed84f9..4e33526bdbffafa000d6867a277f6da30f28b248 100644
--- a/ui/base/android/window_android.cc
+++ b/ui/base/android/window_android.cc
@@ -9,6 +9,7 @@
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "jni/WindowAndroid_jni.h"
+#include "ui/base/android/ui_resource_client_android.h"
 #include "ui/base/android/window_android_compositor.h"
 #include "ui/base/android/window_android_observer.h"
 
@@ -87,6 +88,19 @@ void WindowAndroid::Animate(base::TimeTicks begin_frame_time) {
       WindowAndroidObserver, observer_list_, OnAnimate(begin_frame_time));
 }
 
+void WindowAndroid::InitializeSystemUIResource(
+    SystemUIResource system_resource,
+    scoped_ptr<UIResourceClientAndroid> resource) {
+  ui_resource_map_.set(system_resource, resource.Pass());
+}
+
+cc::UIResourceId WindowAndroid::GetSystemUIResource(
+    SystemUIResource system_resource) {
+  if (ui_resource_map_.find(system_resource) == ui_resource_map_.end())

[jdduke (slow), 2014/07/08 20:10:11]

Premature optimization nit =/: Might as well use get once to save a query:

UIResourceClientAndroid* client = ui_resource_map_.get(system_resource);
return client ? client->id() : 0;

[powei, 2014/07/12 00:24:46]

Done.  No longer here.

+    return 0;
+  return ui_resource_map_.get(system_resource)->id();
+}
+
 void WindowAndroid::OnVSync(JNIEnv* env, jobject obj, jlong time_micros) {
   base::TimeTicks frame_time(base::TimeTicks::FromInternalValue(time_micros));
   FOR_EACH_OBSERVER(