Add mouse input forwarding to gpu service

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
diff --git a/content/common/gpu/gpu_messages.h b/content/common/gpu/gpu_messages.h
index 4375debb68194c51cec3ff9cf04ce6e5f4207411..611fad23b677f55b095e087946b60765d024a88f 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -10,6 +10,7 @@
 
 #include "base/memory/shared_memory.h"
 #include "content/common/content_export.h"
+#include "content/common/content_param_traits.h"
 #include "content/common/gpu/gpu_memory_uma_stats.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/common/gpu/gpu_result_codes.h"
@@ -27,6 +28,7 @@
 #include "media/base/video_frame.h"
 #include "media/video/video_decode_accelerator.h"
 #include "media/video/video_encode_accelerator.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/events/latency_info.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/native_widget_types.h"
@@ -294,6 +296,11 @@ IPC_MESSAGE_CONTROL0(GpuMsg_Hang)
 // Tells the GPU process to disable the watchdog thread.
 IPC_MESSAGE_CONTROL0(GpuMsg_DisableWatchdog)
 
+// Sends an input event to the gpu service.
+IPC_MESSAGE_CONTROL2(GpuMsg_HandleInputEvent,
+                     IPC::WebInputEventPointer /* event */,
+                     bool /* is_keyboard_shortcut */)
+
 //------------------------------------------------------------------------------
 // GPU Host Messages
 // These are messages to the browser.