[android] Make RWHVAndroid a BeginFrameObserver.

ui/android/window_android.h

 // 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.
 
 #ifndef UI_ANDROID_WINDOW_ANDROID_H_
 #define UI_ANDROID_WINDOW_ANDROID_H_
 
 #include <jni.h>
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "ui/android/ui_android_export.h"
 #include "ui/android/view_android.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
+namespace cc {
+class BeginFrameSource;
+}  // namespace cc
+
 namespace display {
 class DisplayAndroidManager;
-}
+}  // namespace display
 
 namespace ui {
 
 class WindowAndroidCompositor;
 class WindowAndroidObserver;
 
 // Android implementation of the activity window.
 // WindowAndroid is also the root of a ViewAndroid tree.
 class UI_ANDROID_EXPORT WindowAndroid : public ViewAndroid {
  public:
@@ skipping 18 matching lines @@
   // Compositor callback relay.
   void OnCompositingDidCommit();
 
   void AttachCompositor(WindowAndroidCompositor* compositor);
   void DetachCompositor();
 
   void AddObserver(WindowAndroidObserver* observer);
   void RemoveObserver(WindowAndroidObserver* observer);
 
   WindowAndroidCompositor* GetCompositor() { return compositor_; }
+  cc::BeginFrameSource* GetBeginFrameSource();
 
-  void RequestVSyncUpdate();
+  void SetNeedsBeginFrames(bool needs_begin_frames);

[boliu, 2016/12/12 21:41:48]

private, and friend WindowBeginFrameSource?

[Eric Seckler, 2016/12/13 10:03:56]

Done.

   void SetNeedsAnimate();
   void Animate(base::TimeTicks begin_frame_time);
   void OnVSync(JNIEnv* env,
                const base::android::JavaParamRef<jobject>& obj,
                jlong time_micros,
                jlong period_micros);
   void OnVisibilityChanged(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& obj,
                            bool visible);
   void OnActivityStopped(JNIEnv* env,
                          const base::android::JavaParamRef<jobject>& obj);
   void OnActivityStarted(JNIEnv* env,
                          const base::android::JavaParamRef<jobject>& obj);
 
   // Return whether the specified Android permission is granted.
   bool HasPermission(const std::string& permission);
   // Return whether the specified Android permission can be requested by Chrome.
   bool CanRequestPermission(const std::string& permission);
 
   static WindowAndroid* CreateForTesting();
   void DestroyForTesting();
 
  private:
   friend class DisplayAndroidManager;
 
   ~WindowAndroid() override;
 
+  void RequestVSyncUpdate();
+
   // ViewAndroid overrides.
   WindowAndroid* GetWindowAndroid() const override;
 
   // The ID of the display that this window belongs to.
   int display_id() const { return display_id_; }
 
   base::android::ScopedJavaGlobalRef<jobject> java_window_;
   const int display_id_;
   gfx::Vector2dF content_offset_;
   WindowAndroidCompositor* compositor_;
 
   base::ObserverList<WindowAndroidObserver> observer_list_;
 
+  class WindowBeginFrameSource;
+  std::unique_ptr<WindowBeginFrameSource> begin_frame_source_;
+  bool needs_begin_frames_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_WINDOW_ANDROID_H_