Adding compositor callbacks to RenderWidgetHostViewAndroid

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 16b967a8be86e2541be5a03b24742fd0c04dfd18..22f20cff8df690309a8e22f8909f2ab7a5b2a7d8 100644
--- a/ui/base/android/window_android.cc
+++ b/ui/base/android/window_android.cc
@@ -9,6 +9,7 @@
 #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 {
 
@@ -50,6 +51,21 @@ bool WindowAndroid::GrabSnapshot(
   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
 // ----------------------------------------------------------------------------