Add mouse input forwarding to gpu service

content/browser/renderer_host/input/input_router_impl.cc

Index: content/browser/renderer_host/input/input_router_impl.cc
diff --git a/content/browser/renderer_host/input/input_router_impl.cc b/content/browser/renderer_host/input/input_router_impl.cc
index 441f9384bb8745e05efd53d9e1e645aa94255124..813b4e42b8138a19c018cfc43db01df96319aacb 100644
--- a/content/browser/renderer_host/input/input_router_impl.cc
+++ b/content/browser/renderer_host/input/input_router_impl.cc
@@ -10,6 +10,7 @@
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
+#include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 #include "content/browser/renderer_host/input/input_ack_handler.h"
 #include "content/browser/renderer_host/input/input_router_client.h"
@@ -17,6 +18,7 @@
 #include "content/browser/renderer_host/input/touchpad_tap_suppression_controller.h"
 #include "content/common/content_constants_internal.h"
 #include "content/common/edit_command.h"
+#include "content/common/gpu/gpu_messages.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/common/input/touch_action.h"
 #include "content/common/input/web_touch_event_traits.h"
@@ -344,9 +346,12 @@ void InputRouterImpl::OfferToHandlers(const WebInputEvent& input_event,
                                       bool is_keyboard_shortcut) {
   output_stream_validator_.Validate(input_event);
 
+  LOG(WARNING) << "InputRouterImpl::OfferToHandlers";
+
   if (OfferToClient(input_event, latency_info))
     return;
 
+  OfferToGpuService(input_event, is_keyboard_shortcut);
   OfferToRenderer(input_event, latency_info, is_keyboard_shortcut);
 
   // Touch events should always indicate in the event whether they are
@@ -409,6 +414,14 @@ bool InputRouterImpl::OfferToRenderer(const WebInputEvent& input_event,
   return false;
 }
 
+bool InputRouterImpl::OfferToGpuService(const blink::WebInputEvent& input_event,
+                                        bool is_keyboard_shortcut) {
+  GpuProcessHostUIShim* shim = GpuProcessHostUIShim::GetOneInstance();
+  return (shim &&
+          shim->Send(
+              new GpuMsg_HandleInputEvent(&input_event, is_keyboard_shortcut)));
+}
+
 void InputRouterImpl::SendSyntheticWheelEventForPinch(
     const GestureEventWithLatencyInfo& pinch_event) {
   // We match typical trackpad behavior on Windows by sending fake wheel events