Notify Blink about start of gesture scroll through a queued event.

third_party/WebKit/Source/core/input/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 350 matching lines @@
     void setLastKnownMousePosition(const PlatformMouseEvent&);
 
     bool shouldTopControlsConsumeScroll(FloatSize) const;
 
     // If the given element is a shadow host and its root has delegatesFocus=false flag,
     // slide focus to its inner element. Returns true if the resulting focus is different from
     // the given element.
     bool slideFocusOnShadowHostIfNecessary(const Element&);
 
     void dispatchPointerEvents(const PlatformTouchEvent&, WillBeHeapVector<TouchInfo>&);
-    void sendPointerCancels(WillBeHeapVector<TouchInfo>&);
 
     WebInputEventResult dispatchTouchEvents(const PlatformTouchEvent&, WillBeHeapVector<TouchInfo>&, bool, bool);
 
     // NOTE: If adding a new field to this class please ensure that it is
     // cleared in |EventHandler::clear()|.
 
     const RawPtrWillBeMember<LocalFrame> m_frame;
 
     // Current button-press state for mouse/mouse-like-stylus.
     // TODO(crbug.com/563676): Buggy for chorded buttons.
@@ skipping 56 matching lines @@
     TouchTargetMap m_targetForTouchID;
 
     // If set, the document of the active touch sequence. Unset if no touch sequence active.
     RefPtrWillBeMember<Document> m_touchSequenceDocument;
     RefPtr<UserGestureToken> m_touchSequenceUserGestureToken;
 
     bool m_touchPressed;
 
     PointerEventManager m_pointerEventManager;
 
-    // This is set upon sending a pointercancel for touch, prevents PE dispatches for touches until
-    // all touch-points become inactive.
-    // TODO(mustaq): Consider a state per pointerType, as in PointerIdManager? Exclude mouse?
-    bool m_inPointerCanceledState;
-
     RefPtrWillBeMember<Node> m_scrollGestureHandlingNode;
     bool m_lastGestureScrollOverWidget;
     // The most recent element to scroll natively during this scroll
     // sequence. Null if no native element has scrolled this scroll
     // sequence, or if the most recent element to scroll used scroll
     // customization.
     RefPtrWillBeMember<Node> m_previousGestureScrolledNode;
     RefPtrWillBeMember<Scrollbar> m_scrollbarHandlingScrollGesture;
 
     double m_maxMouseMovedDuration;
@@ skipping 12 matching lines @@
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::EventHandler::TouchInfo);
 
 #endif // EventHandler_h