Move slider implemention to use pointer capture

third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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.
@@ skipping 23 matching lines @@
 
 #include "core/HTMLNames.h"
 #include "core/html/HTMLDivElement.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class HTMLInputElement;
 class Event;
 class TouchEvent;
+class PointerEvent;
 
 class SliderThumbElement final : public HTMLDivElement {
  public:
   static SliderThumbElement* create(Document&);
 
   void setPositionFromValue();
 
-  void dragFrom(const LayoutPoint&);
+  void dragFrom(const PointerEvent*);
   void defaultEventHandler(Event*) override;
   bool willRespondToMouseMoveEvents() override;
   bool willRespondToMouseClickEvents() override;
   void detachLayoutTree(const AttachContext& = AttachContext()) override;
   const AtomicString& shadowPseudoId() const override;
   HTMLInputElement* hostInput() const;
   void setPositionFromPoint(const LayoutPoint&);
-  void stopDragging();
+  void releasePointerCapture();
 
  private:
   SliderThumbElement(Document&);
   LayoutObject* createLayoutObject(const ComputedStyle&) override;
   Element* cloneElementWithoutAttributesAndChildren() override;
   bool isDisabledFormControl() const override;
   bool matchesReadOnlyPseudoClass() const override;
   bool matchesReadWritePseudoClass() const override;
   Node* focusDelegate() override;
+  void requestPointerCapture(int pointerId);
+  void stopDragging();
   void startDragging();
 
   bool m_inDragMode;
+  int m_requestedPointerIdToCapture;
 };
 
 inline Element* SliderThumbElement::cloneElementWithoutAttributesAndChildren() {
   return create(document());
 }
 
 // FIXME: There are no ways to check if a node is a SliderThumbElement.
 DEFINE_ELEMENT_TYPE_CASTS(SliderThumbElement, isHTMLElement());
 
 class SliderContainerElement final : public HTMLDivElement {
@@ skipping 21 matching lines @@
 
   bool m_hasTouchEventHandler;
   bool m_touchStarted;
   Direction m_slidingDirection;
   LayoutPoint m_startPoint;
 };
 
 }  // namespace blink
 
 #endif