Move slider implemention to use pointer capture

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

Index: third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h
diff --git a/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h b/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h
index 8082e82e4cc522f373f63851593ebac08e96420e..a7cd465a299e9e0d25f41fe741f58d8f86c8b402 100644
--- a/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h
+++ b/third_party/WebKit/Source/core/html/shadow/SliderThumbElement.h
@@ -41,6 +41,7 @@ namespace blink {
 class HTMLInputElement;
 class Event;
 class TouchEvent;
+class PointerEvent;
 
 class SliderThumbElement final : public HTMLDivElement {
  public:
@@ -48,7 +49,7 @@ class SliderThumbElement final : public HTMLDivElement {
 
   void setPositionFromValue();
 
-  void dragFrom(const LayoutPoint&);
+  void dragFrom(const PointerEvent*);
   void defaultEventHandler(Event*) override;
   bool willRespondToMouseMoveEvents() override;
   bool willRespondToMouseClickEvents() override;
@@ -56,7 +57,7 @@ class SliderThumbElement final : public HTMLDivElement {
   const AtomicString& shadowPseudoId() const override;
   HTMLInputElement* hostInput() const;
   void setPositionFromPoint(const LayoutPoint&);
-  void stopDragging();
+  void releasePointerCapture();
 
  private:
   SliderThumbElement(Document&);
@@ -66,9 +67,12 @@ class SliderThumbElement final : public HTMLDivElement {
   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() {