Keep track of coalesced events in main thread event queue

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 745c913e5845d98ec0ca28a6ae455e306aef7788..933870fcaa9a9bc48261572dd74fddbbfee1e807 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -468,9 +468,11 @@ class CONTENT_EXPORT RenderWidget
 #endif
 
   // RenderWidget IPC message handlers
-  void OnHandleInputEvent(const blink::WebInputEvent* event,
-                          const ui::LatencyInfo& latency_info,
-                          InputEventDispatchType dispatch_type);
+  void OnHandleInputEvent(
+      const blink::WebInputEvent* event,
+      const std::vector<const blink::WebInputEvent*>& coalescedEvents,
+      const ui::LatencyInfo& latency_info,
+      InputEventDispatchType dispatch_type);
   void OnCursorVisibilityChange(bool is_visible);
   void OnMouseCaptureLost();
   void OnSetEditCommandsForNextKeyEvent(const EditCommands& edit_commands);