[cc] Add and use BeginFrameAck for DidFinishFrame.

ui/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/android/window_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 21 matching lines @@
         observers_(
             base::ObserverList<cc::BeginFrameObserver>::NOTIFY_EXISTING_ONLY),
         observer_count_(0),
         next_sequence_number_(cc::BeginFrameArgs::kStartingFrameNumber) {}
   ~WindowBeginFrameSource() override {}
 
   // cc::BeginFrameSource implementation.
   void AddObserver(cc::BeginFrameObserver* obs) override;
   void RemoveObserver(cc::BeginFrameObserver* obs) override;
   void DidFinishFrame(cc::BeginFrameObserver* obs,
-                      size_t remaining_frames) override {}
+                      const cc::BeginFrameAck& ack) override {}
   bool IsThrottled() const override { return true; }
 
   void OnVSync(base::TimeTicks frame_time, base::TimeDelta vsync_period);
 
  private:
   WindowAndroid* const window_;
   base::ObserverList<cc::BeginFrameObserver> observers_;
   int observer_count_;
   cc::BeginFrameArgs last_begin_frame_args_;
   uint64_t next_sequence_number_;
@@ skipping 219 matching lines @@
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj, int sdk_display_id) {
   WindowAndroid* window = new WindowAndroid(env, obj, sdk_display_id);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui