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 5c3b1dc54ceddf4b913a3414b62b7db0c27f5097..9e5fee4ca191d5963cee8ed82fa329a9db79f205 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/message_router.h"
+#include "gpu/command_buffer/common/value_state.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/command_buffer/service/mailbox_manager_impl.h"
@@ -177,6 +178,7 @@ bool GpuChannelManager::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(GpuMsg_DestroyGpuMemoryBuffer, OnDestroyGpuMemoryBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_LoadedShader, OnLoadedShader)
     IPC_MESSAGE_HANDLER(GpuMsg_RelinquishResources, OnRelinquishResources)
+    IPC_MESSAGE_HANDLER(GpuMsg_UpdateValueState, OnUpdateValueState)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -286,6 +288,16 @@ void GpuChannelManager::OnDestroyGpuMemoryBuffer(
   }
 }
 
+void GpuChannelManager::OnUpdateValueState(
+    int client_id, unsigned int target, const gpu::ValueState& state) {
+  // Only pass updated state to the channel corresponding to the
+  // render_widget_host where the event originated.
+  GpuChannelMap::const_iterator iter = gpu_channels_.find(client_id);
+  if (iter != gpu_channels_.end()) {
+    iter->second->HandleUpdateValueState(target, state);
+  }
+}
+
 void GpuChannelManager::OnLoadedShader(std::string program_proto) {
   if (program_cache())
     program_cache()->LoadProgram(program_proto);