OverscrollGlow for mainThread-{BLINK CHANGES}

public/web/WebWidgetClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 134 matching lines @@
     // including when a lock is pending but not yet acquired.
     // WebWidget::didLosePointerLock() is called when unlock is complete.
     virtual void requestPointerUnlock() { }
 
     // Returns true iff the pointer is locked to this widget.
     virtual bool isPointerLocked() { return false; }
 
     // Called when a gesture event is handled.
     virtual void didHandleGestureEvent(const WebGestureEvent& event, bool eventCancelled) { }
 
+    // Called when overscrolled on main thread.
+    virtual void didOverScrollOnMainThread(const float& unusedDeltaX, const float& unusedDeltaY, const float& accumaltedRootOverScrollX, const float& accumaltedRootOverScrollY, const float& positionX, const float& positionY, const float& velocityX, const float& velocityY) { }
+
     // Called to update if touch events should be sent.
     virtual void hasTouchEventHandlers(bool) { }
 
     // Called during WebWidget::HandleInputEvent for a TouchStart event to inform the embedder
     // of the touch actions that are permitted for this touch.
     virtual void setTouchAction(WebTouchAction touchAction) { }
 
     // Called when value of focused text field gets dirty, e.g. value is
     // modified by script, not by user input.
     virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
@@ skipping 15 matching lines @@
     // something as a result of a tap without explicitly consuming the event.
     virtual void showUnhandledTapUIIfNeeded(const WebPoint& tappedPosition,
         const WebNode& tappedNode, bool pageChanged) { }
 protected:
     ~WebWidgetClient() { }
 };
 
 } // namespace blink
 
 #endif