Add latency measurement system

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 4666171811be133a169cf31da870b7b16c5347fd..52270efde30372ae5beda7ed919f3fee19560e77 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1890,6 +1890,7 @@ WebStorageNamespace* RenderViewImpl::createSessionStorageNamespace(
 }
 
 WebKit::WebCompositorOutputSurface* RenderViewImpl::createOutputSurface() {
+  CommandBufferProxyImpl* proxy = NULL;
   // Explicitly disable antialiasing for the compositor. As of the time of
   // this writing, the only platform that supported antialiasing for the
   // compositor was Mac OS X, because the on-screen OpenGL context creation
@@ -1904,7 +1905,7 @@ WebKit::WebCompositorOutputSurface* RenderViewImpl::createOutputSurface() {
   attributes.antialias = false;
   attributes.shareResources = true;
   attributes.noAutomaticFlushes = true;
-  WebGraphicsContext3D* context = CreateGraphicsContext3D(attributes);
+  WebGraphicsContext3D* context = CreateGraphicsContext3D(attributes, &proxy);
   if (!context)
     return NULL;
 
@@ -1913,10 +1914,10 @@ WebKit::WebCompositorOutputSurface* RenderViewImpl::createOutputSurface() {
       // In the absence of a software-based delegating renderer, use this
       // stopgap adapter class to present the software renderer output using a
       // 3d context.
-      return new CompositorOutputSurface(routing_id(), NULL,
+      return new CompositorOutputSurface(routing_id(), NULL, NULL,
           new CompositorSoftwareOutputDeviceGLAdapter(context));
   } else
-      return new CompositorOutputSurface(routing_id(), context, NULL);
+      return new CompositorOutputSurface(routing_id(), context, proxy, NULL);
 }
 
 void RenderViewImpl::didAddMessageToConsole(
@@ -3877,7 +3878,9 @@ void RenderViewImpl::CheckPreferredSize() {
 }
 
 WebGraphicsContext3D* RenderViewImpl::CreateGraphicsContext3D(
-    const WebGraphicsContext3D::Attributes& attributes) {
+    const WebGraphicsContext3D::Attributes& attributes,
+    CommandBufferProxyImpl** proxy) {
+  *proxy = NULL;
   if (!webview())
     return NULL;
 
@@ -3906,6 +3909,7 @@ WebGraphicsContext3D* RenderViewImpl::CreateGraphicsContext3D(
             false /* bind generates resources */,
             CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE))
       return NULL;
+    *proxy = context->GetCommandBufferProxy();
     return context.release();
   }
 }