Add latency measurement system

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index 2612db2a68d766743fb0ce32b52b6448a6cbe3d9..5570faeb53fb7ad30a65ff5a5eb69c5d27671fa1 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -161,7 +161,8 @@ bool GpuCommandBufferStub::OnMessageReceived(const IPC::Message& message) {
   if (decoder_.get() &&
       message.type() != GpuCommandBufferMsg_Echo::ID &&
       message.type() != GpuCommandBufferMsg_RetireSyncPoint::ID &&
-      message.type() != GpuCommandBufferMsg_WaitSyncPoint::ID) {
+      message.type() != GpuCommandBufferMsg_WaitSyncPoint::ID &&
+      message.type() != GpuCommandBufferMsg_SetLatencyInfo::ID) {
     if (!MakeCurrent())
       return false;
   }
@@ -183,6 +184,7 @@ bool GpuCommandBufferStub::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_GetStateFast,
                                     OnGetStateFast);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_AsyncFlush, OnAsyncFlush);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_SetLatencyInfo, OnSetLatencyInfo);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_Rescheduled, OnRescheduled);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_CreateTransferBuffer,
                                     OnCreateTransferBuffer);
@@ -523,6 +525,22 @@ void GpuCommandBufferStub::OnInitialize(
   }
 }
 
+void GpuCommandBufferStub::OnSetLatencyInfo(
+    const WebKit::WebLatencyInfoImpl& latency_info) {
+  if (!latency_info_callback_.is_null())
+    latency_info_callback_.Run(latency_info);
+}
+
+void GpuCommandBufferStub::SetLatencyInfoCallback(
+    const LatencyInfoCallback& callback) {
+  latency_info_callback_ = callback;
+}
+
+void GpuCommandBufferStub::SetLatencyInfo(
+    const WebKit::WebLatencyInfoImpl& latency_info) {
+  Send(new GpuCommandBufferMsg_SetLatencyInfo(route_id_, latency_info));
+}
+
 void GpuCommandBufferStub::OnSetGetBuffer(
     int32 shm_id, IPC::Message* reply_message) {
   TRACE_EVENT0("gpu", "GpuCommandBufferStub::OnSetGetBuffer");