android: Use UIResource for overscroll glow

ui/base/android/window_android.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/android/window_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #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"
 
 namespace ui {
 
 using base::android::AttachCurrentThread;
 using base::android::ScopedJavaLocalRef;
 
 WindowAndroid::WindowAndroid(JNIEnv* env, jobject obj, jlong vsync_period)
   : weak_java_window_(env, obj),
@@ skipping 58 matching lines @@
 void WindowAndroid::SetNeedsAnimate() {
   if (compositor_)
     compositor_->SetNeedsAnimate();
 }
 
 void WindowAndroid::Animate(base::TimeTicks begin_frame_time) {
   FOR_EACH_OBSERVER(
       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(
       WindowAndroidObserver,
       observer_list_,
       OnVSync(frame_time, vsync_period_));
   if (compositor_)
     compositor_->OnVSync(frame_time, vsync_period_);
 }
 
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, jobject obj, jlong vsync_period) {
   WindowAndroid* window = new WindowAndroid(env, obj, vsync_period);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui