Adding compositor callbacks to RenderWidgetHostViewAndroid

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_helper.h"
 #include "base/android/scoped_java_ref.h"
 #include "jni/WindowAndroid_jni.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)
   : weak_java_window_(env, obj) {
 }
 
@@ skipping 21 matching lines @@
                                       content_x + content_offset_.x(),
                                       content_y + content_offset_.y(),
                                       width, height);
   if (result.is_null())
     return false;
   base::android::JavaByteArrayToByteVector(
       env, result.obj(), png_representation);
   return true;
 }
 
+void WindowAndroid::OnCompositingDidCommit() {
+  FOR_EACH_OBSERVER(WindowAndroidObserver,
+                    observer_list_,
+                    OnCompositingDidCommit());
+}
+
+void WindowAndroid::AddObserver(WindowAndroidObserver* observer) {
+  if (!observer_list_.HasObserver(observer))
+    observer_list_.AddObserver(observer);
+}
+
+void WindowAndroid::RemoveObserver(WindowAndroidObserver* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, jobject obj) {
   WindowAndroid* window = new WindowAndroid(env, obj);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui