New media playback UI.

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 50 matching lines @@
 private:
     SliderThumbElement(Document&);
     LayoutObject* createLayoutObject(const ComputedStyle&) override;
     PassRefPtrWillBeRawPtr<Element> cloneElementWithoutAttributesAndChildren() override;
     bool isDisabledFormControl() const override;
     bool matchesReadOnlyPseudoClass() const override;
     bool matchesReadWritePseudoClass() const override;
     Node* focusDelegate() override;
     void startDragging();
 
+    // Return true if we're any part of a media slider.
+    bool isMediaSlider() const;
+
     bool m_inDragMode;
+    bool m_didDragAnywhere;
+    LayoutPoint m_mouseDownLocation;
 };
 
 inline PassRefPtrWillBeRawPtr<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 {
 public:
     DECLARE_NODE_FACTORY(SliderContainerElement);
 
 private:
     explicit SliderContainerElement(Document&);
     LayoutObject* createLayoutObject(const ComputedStyle&) override;
     const AtomicString& shadowPseudoId() const override;
 };
 
 }
 
 #endif