Use estimated vsync period on Android

ui/base/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_BASE_ANDROID_WINDOW_ANDROID_H_
 #define UI_BASE_ANDROID_WINDOW_ANDROID_H_
 
 #include <jni.h>
 #include <vector>
 #include "base/android/jni_weak_ref.h"
@@ skipping 36 matching lines @@
   void DetachCompositor();
 
   void AddObserver(WindowAndroidObserver* observer);
   void RemoveObserver(WindowAndroidObserver* observer);
 
   WindowAndroidCompositor* GetCompositor() { return compositor_; }
 
   void RequestVSyncUpdate();
   void SetNeedsAnimate();
   void OnVSync(JNIEnv* env, jobject obj, jlong time_micros);
+  void UpdateVSyncPeriod(JNIEnv* env, jobject obj, jlong period_micros);
   void Animate(base::TimeTicks begin_frame_time);
 
  private:
   ~WindowAndroid();
 
   JavaObjectWeakGlobalRef weak_java_window_;
   gfx::Vector2dF content_offset_;
   WindowAndroidCompositor* compositor_;
   base::TimeDelta vsync_period_;
 
   ObserverList<WindowAndroidObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_ANDROID_WINDOW_ANDROID_H_