Add latency measurement system

content/common/gpu/client/command_buffer_proxy_impl.cc

Index: content/common/gpu/client/command_buffer_proxy_impl.cc
diff --git a/content/common/gpu/client/command_buffer_proxy_impl.cc b/content/common/gpu/client/command_buffer_proxy_impl.cc
index 856ef7ebe4c20c11f1d111836364bd9fa0032610..48a67f8f1c7dab578ffd85ed40fc2e7bc8122798 100644
--- a/content/common/gpu/client/command_buffer_proxy_impl.cc
+++ b/content/common/gpu/client/command_buffer_proxy_impl.cc
@@ -58,6 +58,8 @@ bool CommandBufferProxyImpl::OnMessageReceived(const IPC::Message& message) {
                         OnSetMemoryAllocation);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SignalSyncPointAck,
                         OnSignalSyncPointAck);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SetLatencyInfo,
+                        OnSetLatencyInfo);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -197,6 +199,22 @@ void CommandBufferProxyImpl::Flush(int32 put_offset) {
                                           ++flush_count_));
 }
 
+void CommandBufferProxyImpl::SetLatencyInfo(
+    const cc::LatencyInfo& latency_info) {
+  Send(new GpuCommandBufferMsg_SetLatencyInfo(route_id_, latency_info));
+}
+
+void CommandBufferProxyImpl::SetLatencyInfoCallback(
+    const GpuLatencyInfoCallback& callback) {
+  latency_info_callback_ = callback;
+}
+
+void CommandBufferProxyImpl::OnSetLatencyInfo(
+    const cc::LatencyInfo& latency_info) {
+  if (!latency_info_callback_.is_null())
+    latency_info_callback_.Run(latency_info);
+}
+
 gpu::CommandBuffer::State CommandBufferProxyImpl::FlushSync(
     int32 put_offset,
     int32 last_known_get) {