Use estimated vsync period on Android

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_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 79 matching lines @@
 void WindowAndroid::OnVSync(JNIEnv* env, jobject obj, jlong time_micros) {
   base::TimeTicks frame_time(base::TimeTicks::FromInternalValue(time_micros));
   FOR_EACH_OBSERVER(
       WindowAndroidObserver,
       observer_list_,
       OnVSync(frame_time, vsync_period_));
   if (compositor_)
     compositor_->OnVSync(frame_time, vsync_period_);
 }
 
+void WindowAndroid::UpdateVSyncPeriod(JNIEnv* env,
+                                      jobject obj,
+                                      jlong period_micros) {
+  vsync_period_ = base::TimeDelta::FromMicroseconds(period_micros);
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, jobject obj, jlong vsync_period) {
   WindowAndroid* window = new WindowAndroid(env, obj, vsync_period);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui