Use input events to improve vsync scheduling

cc/thread_proxy.cc

 // Copyright 2011 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 "cc/thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/delay_based_time_source.h"
 #include "cc/draw_quad.h"
@@ skipping 307 matching lines @@
 }
 
 void ThreadProxy::didVSync(base::TimeTicks frameTime)
 {
     DCHECK(isImplThread());
     TRACE_EVENT0("cc", "ThreadProxy::didVSync");
     if (m_vsyncClient)
         m_vsyncClient->DidVSync(frameTime);
 }
 
+void ThreadProxy::didReceiveLastInputEventForVSync()
+{
+    DCHECK(isImplThread());
+    TRACE_EVENT0("cc", "ThreadProxy::didReceiveLastInputEventForVSync");
+    if (m_vsyncClient)
+        m_vsyncClient->DidReceiveLastInputEventForVSync();
+}
+
 void ThreadProxy::onCanDrawStateChanged(bool canDraw)
 {
     DCHECK(isImplThread());
     TRACE_EVENT1("cc", "ThreadProxy::onCanDrawStateChanged", "canDraw", canDraw);
     m_schedulerOnImplThread->setCanDraw(canDraw);
 }
 
 void ThreadProxy::onHasPendingTreeStateChanged(bool hasPendingTree)
 {
     DCHECK(isImplThread());
@@ skipping 720 matching lines @@
 }
 
 void ThreadProxy::capturePictureOnImplThread(CompletionEvent* completion, skia::RefPtr<SkPicture>* picture)
 {
     DCHECK(isImplThread());
     *picture = m_layerTreeHostImpl->capturePicture();
     completion->signal();
 }
 
 }  // namespace cc