Add latency measurement system

cc/single_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/single_thread_proxy.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/draw_quad.h"
 #include "cc/layer_tree_host.h"
 #include "cc/output_surface.h"
@@ skipping 316 matching lines @@
         if (m_rendererInitialized)
             m_layerTreeHostImpl->renderer()->doNoOp();
     }
 }
 
 void SingleThreadProxy::onSwapBuffersCompleteOnImplThread()
 {
     NOTREACHED();
 }
 
+void SingleThreadProxy::onReceivedLatencyInfo(const LatencyInfo& latencyInfo)
+{
+    m_layerTreeHost->onReceivedLatencyInfo(latencyInfo);
+}
+
 bool SingleThreadProxy::commitAndComposite()
 {
     DCHECK(Proxy::isMainThread());
 
     if (!m_layerTreeHost->initializeRendererIfNeeded())
         return false;
 
     m_layerTreeHost->contentsTextureManager()->unlinkAndClearEvictedBackings();
 
     scoped_ptr<ResourceUpdateQueue> queue = make_scoped_ptr(new ResourceUpdateQueue);
@@ skipping 51 matching lines @@
         m_layerTreeHost->didCommitAndDrawFrame();
     }
 }
 
 bool SingleThreadProxy::commitPendingForTesting()
 {
     return false;
 }
 
 }  // namespace cc