Add mouse input forwarding to gpu service

content/common/gpu/gpu_channel_manager.cc

Index: content/common/gpu/gpu_channel_manager.cc
diff --git a/content/common/gpu/gpu_channel_manager.cc b/content/common/gpu/gpu_channel_manager.cc
index d52bca38c8e78b91502d738a6e417968a354b3fe..437990236a861db925fbec6942ef672c86590ae9 100644
--- a/content/common/gpu/gpu_channel_manager.cc
+++ b/content/common/gpu/gpu_channel_manager.cc
@@ -11,6 +11,7 @@
 #include "content/common/gpu/gpu_memory_manager.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/gpu/sync_point_manager.h"
+#include "content/common/input/web_input_event_traits.h"
 #include "content/common/message_router.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
@@ -160,6 +161,7 @@ bool GpuChannelManager::OnMessageReceived(const IPC::Message& msg) {
                         OnCreateViewCommandBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_DestroyGpuMemoryBuffer, OnDestroyGpuMemoryBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_LoadedShader, OnLoadedShader)
+    IPC_MESSAGE_HANDLER(GpuMsg_HandleInputEvent, OnHandleInputEvent)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -263,6 +265,15 @@ void GpuChannelManager::OnDestroyGpuMemoryBuffer(
   }
 }
 
+void GpuChannelManager::OnHandleInputEvent(
+    const blink::WebInputEvent* input_event,
+    bool is_keyboard_shortcut) {
+  const char* const event_name =
+      WebInputEventTraits::GetName(input_event->type);
+  TRACE_EVENT1(
+      "gpu", "GpuChannelManager::OnHandleInputEvent", "event", event_name);
+}
+
 void GpuChannelManager::OnLoadedShader(std::string program_proto) {
   if (program_cache())
     program_cache()->LoadProgram(program_proto);