cc: Make scheduling be driven by vsync for android webview.

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index 8494ed176785b50b0247871ab0c4886bfe3a4655..a36d30ca212458f2fcd4fef3120ad6ddeed5e1c5 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -65,6 +65,7 @@
 #include "net/base/auth.h"
 #include "net/cert/x509_certificate.h"
 #include "third_party/skia/include/core/SkPicture.h"
+#include "ui/base/android/window_android.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/image/image.h"
@@ -199,6 +200,9 @@ AwContents::AwContents(scoped_ptr<WebContents> web_contents)
   InitDataReductionProxyIfNecessary();
   if (autofill_manager_delegate)
     InitAutofillIfNecessary(autofill_manager_delegate->GetSaveFormData());
+  ContentViewCore* cvc =
+      ContentViewCore::FromWebContents(web_contents_.get());
+  if (cvc) cvc->GetWindowAndroid()->AddObserver(this);
   content::SynchronousCompositor::SetClientForWebContents(
       web_contents_.get(), &browser_view_renderer_);
 }
@@ -282,6 +286,9 @@ void AwContents::SetAwAutofillClient(jobject client) {
 
 AwContents::~AwContents() {
   DCHECK_EQ(this, AwContents::FromWebContents(web_contents_.get()));
+  ContentViewCore* cvc =
+      ContentViewCore::FromWebContents(web_contents_.get());
+  if (cvc) cvc->GetWindowAndroid()->RemoveObserver(this);
   content::SynchronousCompositor::SetClientForWebContents(web_contents_.get(),
                                                           NULL);
   web_contents_->RemoveUserData(kAwContentsUserDataKey);
@@ -995,10 +1002,20 @@ void AwContents::DidOverscroll(gfx::Vector2d overscroll_delta) {
       env, obj.obj(), overscroll_delta.x(), overscroll_delta.y());
 }
 
+void AwContents::RequestVSyncUpdate() {
+  ContentViewCore* cvc = ContentViewCore::FromWebContents(web_contents_.get());
+  if (cvc) cvc->GetWindowAndroid()->RequestVSyncUpdate();
+}
+
 const BrowserViewRenderer* AwContents::GetBrowserViewRenderer() const {
   return &browser_view_renderer_;
 }
 
+void AwContents::OnVSync(base::TimeTicks frame_time, 
+    base::TimeDelta vsync_period) {
+  browser_view_renderer_.OnVSync(frame_time, vsync_period);
+}
+
 void AwContents::SetDipScale(JNIEnv* env, jobject obj, jfloat dip_scale) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   browser_view_renderer_.SetDipScale(dip_scale);