Add mouse input forwarding to gpu service

content/common/gpu/gpu_channel_manager.h

Index: content/common/gpu/gpu_channel_manager.h
diff --git a/content/common/gpu/gpu_channel_manager.h b/content/common/gpu/gpu_channel_manager.h
index 1b5f6687e38e34fb183ef20751c2910e8801107c..30c3eff3b5f702543c386265552cb6edb3ba02f6 100644
--- a/content/common/gpu/gpu_channel_manager.h
+++ b/content/common/gpu/gpu_channel_manager.h
@@ -15,6 +15,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "build/build_config.h"
+#include "content/common/content_param_traits.h"
 #include "content/common/gpu/devtools_gpu_instrumentation.h"
 #include "content/common/gpu/gpu_memory_manager.h"
 #include "ipc/ipc_listener.h"
@@ -34,6 +35,7 @@ struct GpuMemoryBufferHandle;
 
 namespace gpu {
 class SyncPointManager;
+union ValueState;
 namespace gles2 {
 class MailboxManager;
 class ProgramCache;
@@ -134,6 +136,9 @@ class GpuChannelManager : public IPC::Listener,
                                 gfx::GpuMemoryBufferId id,
                                 int client_id,
                                 int32 sync_point);
+  void OnUpdateValueState(int client_id,
+                          unsigned int target,
+                          const gpu::ValueState& state);
 
   void OnLoseAllContexts();