OverscrollGlow for mainThread-{BLINK CHANGES}

Source/core/page/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 110 matching lines @@
     void scheduleHoverStateUpdate();
     void scheduleCursorUpdate();
 
     // Return whether a mouse cursor update is currently pending.  Used for testing.
     bool cursorUpdatePending();
 
     void setResizingFrameSet(HTMLFrameSetElement*);
 
     void resizeScrollableAreaDestroyed();
 
+    FloatSize unusedDeltaForTesting() const { return m_unusedDelta; }
+    FloatSize accumulatedRootOverscrollForTesting() const { return m_accumulatedRootOverscroll; }
+
     IntPoint lastKnownMousePosition() const;
 
     // Attempts to scroll the DOM tree. If that fails, scrolls the view.
     // If the view can't be scrolled either, recursively bubble to the parent frame.
     bool bubblingScroll(ScrollDirection, ScrollGranularity, Node* startingNode = nullptr);
 
     bool handleMouseMoveEvent(const PlatformMouseEvent&);
     void handleMouseLeaveEvent(const PlatformMouseEvent&);
 
     bool handleMousePressEvent(const PlatformMouseEvent&);
@@ skipping 113 matching lines @@
     // False if we reached the root and couldn't scroll anything.
     // direction - The direction to scroll in. If this is a logical direction, it will be
     //             converted to the physical direction based on a node's writing mode.
     // granularity - The units that the  scroll delta parameter is in.
     // startNode - The node to start bubbling the scroll from. If a node can't scroll,
     //             the scroll bubbles up to the containing block.
     // stopNode - On input, if provided and non-null, the node at which we should stop bubbling on input.
     //            On output, if provided and a node was scrolled stopNode will point to that node.
     // delta - The delta to scroll by, in the units of the granularity parameter. (e.g. pixels, lines, pages, etc.)
     // absolutePoint - For wheel scrolls - the location, in absolute coordinates, where the event occured.
-    bool scroll(ScrollDirection, ScrollGranularity, Node* startNode = nullptr, Node** stopNode = nullptr, float delta = 1.0f, IntPoint absolutePoint = IntPoint());
+    ScrollResultOneDimensional scroll(ScrollDirection, ScrollGranularity, Node* startNode = nullptr, Node** stopNode = nullptr, float delta = 1.0f, IntPoint absolutePoint = IntPoint());
 
     void customizedScroll(const Node& startNode, ScrollState&);
 
     TouchAction intersectTouchAction(const TouchAction, const TouchAction);
     TouchAction computeEffectiveTouchAction(const Node&);
 
     HitTestResult hitTestResultInFrame(LocalFrame*, const LayoutPoint&, HitTestRequest::HitTestRequestType hitType = HitTestRequest::ReadOnly | HitTestRequest::Active);
 
     void invalidateClick();
 
@@ skipping 96 matching lines @@
     int m_clickCount;
     RefPtrWillBeMember<Node> m_clickNode;
 
     RefPtrWillBeMember<Node> m_dragTarget;
     bool m_shouldOnlyFireDragOverEvent;
 
     RefPtrWillBeMember<HTMLFrameSetElement> m_frameSetBeingResized;
 
     LayoutSize m_offsetFromResizeCorner; // In the coords of m_resizeScrollableArea.
 
+    FloatSize m_unusedDelta;
+    FloatSize m_accumulatedRootOverscroll;
+
     bool m_mousePositionIsUnknown;
     // The last mouse movement position this frame has seen in root frame coordinates.
     IntPoint m_lastKnownMousePosition;
     IntPoint m_lastKnownMouseGlobalPosition;
     IntPoint m_mouseDownPos; // In our view's coords.
     double m_mouseDownTimestamp;
     PlatformMouseEvent m_mouseDown;
     RefPtr<UserGestureToken> m_lastMouseDownUserGestureToken;
 
     RefPtrWillBeMember<Node> m_latchedWheelEventNode;
@@ skipping 34 matching lines @@
     // scroll sequence in this frame, or any child frames. Only used
     // with ScrollCustomization. If some delta has been consumed, a
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 #endif // EventHandler_h