Add latency measurement system

content/common/gpu/client/command_buffer_proxy_impl.h

Index: content/common/gpu/client/command_buffer_proxy_impl.h
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.h b/content/common/gpu/client/command_buffer_proxy_impl.h
index 73f53a779af1ad0b81d33bdec63eb3074ea60a23..2768cb62f99682adb47a24849040f06743d48090 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.h
+++ b/content/common/gpu/client/command_buffer_proxy_impl.h
@@ -24,6 +24,7 @@
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/command_buffer_shared.h"
 #include "ipc/ipc_listener.h"
+#include "webkit/compositor_bindings/web_latency_info_impl.h"
 
 struct GPUCommandBufferConsoleMessage;
 
@@ -43,6 +44,8 @@ class CommandBufferProxyImpl
  public:
   typedef base::Callback<void(
       const std::string& msg, int id)> GpuConsoleMessageCallback;
+  typedef base::Callback<void(
+      const WebKit::WebLatencyInfoImpl&)> GpuLatencyInfoCallback;
 
   CommandBufferProxyImpl(GpuChannelHost* channel, int route_id);
   virtual ~CommandBufferProxyImpl();
@@ -126,6 +129,10 @@ class CommandBufferProxyImpl
   void SetOnConsoleMessageCallback(
       const GpuConsoleMessageCallback& callback);
 
+  void SetLatencyInfo(const WebKit::WebLatencyInfoImpl& latency_info);
+
+  void SetLatencyInfoCallback(const GpuLatencyInfoCallback& callback);
+
   // TODO(apatrick): this is a temporary optimization while skia is calling
   // ContentGLContext::MakeCurrent prior to every GL call. It saves returning 6
   // ints redundantly when only the error is needed for the
@@ -155,6 +162,7 @@ class CommandBufferProxyImpl
   void OnSetMemoryAllocation(const GpuMemoryAllocationForRenderer& allocation);
   void OnSignalSyncPointAck(uint32 id);
   void OnGenerateMailboxNamesReply(const std::vector<std::string>& names);
+  void OnSetLatencyInfo(const WebKit::WebLatencyInfoImpl& latency_info);
 
   // Try to read an updated copy of the state from shared memory.
   void TryUpdateState();
@@ -191,6 +199,8 @@ class CommandBufferProxyImpl
 
   GpuConsoleMessageCallback console_message_callback_;
 
+  GpuLatencyInfoCallback latency_info_callback_;
+
   // Tasks to be invoked in SignalSyncPoint responses.
   uint32 next_signal_id_;
   SignalTaskMap signal_tasks_;