Add telemetry to track the time an event spent waiting for the main thread.

content/renderer/gpu/input_event_filter.h

Index: content/renderer/gpu/input_event_filter.h
diff --git a/content/renderer/gpu/input_event_filter.h b/content/renderer/gpu/input_event_filter.h
index 1f44e09015e1dbf152eb4ff1d214383da65b4fae..fc96f00de1c3dff4a3e2c68dfa706e21569cd06a 100644
--- a/content/renderer/gpu/input_event_filter.h
+++ b/content/renderer/gpu/input_event_filter.h
@@ -60,7 +60,8 @@ class CONTENT_EXPORT InputEventFilter
   // Expects a InputMsg_HandleInputEvent message.
   static const WebKit::WebInputEvent* CrackMessage(
       const IPC::Message& message,
-      ui::LatencyInfo* latency_info);
+      ui::LatencyInfo* latency_info,
+      bool* is_keyboard_shortcut);
 
  private:
   friend class IPC::ChannelProxy::MessageFilter;