Android: Consolidate and simplify VSync logic

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"
 #include "jni/WindowAndroid_jni.h"
 #include "ui/base/android/window_android_compositor.h"
 #include "ui/base/android/window_android_observer.h"
 
 namespace ui {
 
 using base::android::AttachCurrentThread;
 using base::android::ScopedJavaLocalRef;
 
-WindowAndroid::WindowAndroid(JNIEnv* env, jobject obj)
+WindowAndroid::WindowAndroid(JNIEnv* env, jobject obj, jlong vsync_period)
   : weak_java_window_(env, obj),
-    compositor_(NULL) {
+    compositor_(NULL),
+    vsync_period_(base::TimeDelta::FromInternalValue(vsync_period)) {
 }
 
 void WindowAndroid::Destroy(JNIEnv* env, jobject obj) {
   delete this;
 }
 
 ScopedJavaLocalRef<jobject> WindowAndroid::GetJavaObject() {
   return weak_java_window_.get(AttachCurrentThread());
 }
 
@@ skipping 49 matching lines @@
 }
 
 void WindowAndroid::DetachCompositor() {
   compositor_ = NULL;
   FOR_EACH_OBSERVER(WindowAndroidObserver,
                     observer_list_,
                     OnDetachCompositor());
   observer_list_.Clear();
 }
 
+void WindowAndroid::RequestVSyncUpdate() {
+  JNIEnv* env = AttachCurrentThread();
+  Java_WindowAndroid_requestVSyncUpdate(env, GetJavaObject().obj());
+}
+
+void WindowAndroid::OnVSync(JNIEnv* env, jobject obj, jlong time_micros) {
+  FOR_EACH_OBSERVER(
+      WindowAndroidObserver,
+      observer_list_,
+      OnVSync(base::TimeTicks::FromInternalValue(time_micros), vsync_period_));
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
-jlong Init(JNIEnv* env, jobject obj) {
-  WindowAndroid* window = new WindowAndroid(env, obj);
+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