Add mouse input forwarding to gpu service

content/common/gpu/gpu_channel.h

Index: content/common/gpu/gpu_channel.h
diff --git a/content/common/gpu/gpu_channel.h b/content/common/gpu/gpu_channel.h
index 0d8538f4889b72d4d094c5923b08417502cfcdcf..4701697450fb8dd996360333deaf7616cbd89e81 100644
--- a/content/common/gpu/gpu_channel.h
+++ b/content/common/gpu/gpu_channel.h
@@ -34,6 +34,7 @@ class WaitableEvent;
 
 namespace gpu {
 class PreemptionFlag;
+union ValueState;
 }
 
 namespace IPC {
@@ -145,6 +146,9 @@ class GpuChannel : public IPC::Listener, public IPC::Sender {
 
   bool allow_future_sync_points() const { return allow_future_sync_points_; }
 
+  void HandleUpdateValueState(unsigned int target,
+                              const gpu::ValueState& state);
+
  private:
   friend class GpuChannelMessageFilter;