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 839de2d55a966c6ffa14103d08ecc30aee75f7b0..36a991ea6437a16ebe034c76259e884d9abc86b6 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"
@@ -20,6 +21,7 @@
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/common/gpu_memory_allocation.h"
 #include "gpu/command_buffer/common/mailbox.h"
+#include "gpu/command_buffer/common/value_state.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/gpu_command_buffer_traits.h"
 #include "ipc/ipc_channel_handle.h"
@@ -301,6 +303,12 @@ IPC_MESSAGE_CONTROL0(GpuMsg_DisableWatchdog)
 // Tells the GPU process that the browser has seen a GPU switch.
 IPC_MESSAGE_CONTROL0(GpuMsg_GpuSwitched)
 
+// Sends an input event to the gpu service.
+IPC_MESSAGE_CONTROL3(GpuMsg_UpdateValueState,
+                     int, /* client_id */
+                     unsigned int, /* target */
+                     gpu::ValueState /* valuestate */)
+
 //------------------------------------------------------------------------------
 // GPU Host Messages
 // These are messages to the browser.