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 3a0d7994a3a78a8a9a40e7cd08c125f31dce8e89..717be8e23f85ce9a6e1670887ad848cfbba86adb 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -158,7 +158,8 @@ 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;
   }
@@ -178,6 +179,7 @@ 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(GpuCommandBufferMsg_RegisterTransferBuffer,
                         OnRegisterTransferBuffer);
@@ -524,6 +526,22 @@ void GpuCommandBufferStub::OnInitialize(
   }
 }
 
+void GpuCommandBufferStub::OnSetLatencyInfo(
+    const cc::LatencyInfo& 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 cc::LatencyInfo& 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");