Seperate DOMVisualViewport from Blink's VisualViewport class

third_party/WebKit/Source/core/frame/DOMWindow.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMWindow_h
 #define DOMWindow_h
 
 #include "bindings/core/v8/Transferables.h"
 #include "core/CoreExport.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowBase64.h"
 #include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollableArea.h"
 
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class ApplicationCache;
 class BarProp;
 class CSSRuleList;
 class CSSStyleDeclaration;
 class CustomElementsRegistry;
 class DOMSelection;
+class DOMVisualViewport;
 class DOMWindowCSS;
 class Document;
 class Element;
 class Frame;
 class FrameRequestCallback;
 class History;
 class IdleRequestCallback;
 class IdleRequestOptions;
 class Location;
 class LocalDOMWindow;
 class MessageEvent;
 class MediaQueryList;
 class Navigator;
 class Screen;
 class ScriptState;
 class ScrollToOptions;
 class SerializedScriptValue;
 class Storage;
 class StyleMedia;
-class VisualViewport;
 
 class CORE_EXPORT DOMWindow : public EventTargetWithInlineData, public DOMWindowBase64 {
     DEFINE_WRAPPERTYPEINFO();
 public:
     ~DOMWindow() override;
 
     // GarbageCollectedFinalized overrides:
     DECLARE_VIRTUAL_TRACE();
 
     virtual bool isLocalDOMWindow() const = 0;
@@ skipping 30 matching lines @@
     virtual int innerWidth() const = 0;
     virtual int screenX() const = 0;
     virtual int screenY() const = 0;
     int screenLeft() const { return screenX(); }
     int screenTop() const { return screenY(); }
     virtual double scrollX() const = 0;
     virtual double scrollY() const = 0;
     double pageXOffset() const { return scrollX(); }
     double pageYOffset() const { return scrollY(); }
 
-    virtual VisualViewport* visualViewport() { return nullptr; }
+    virtual DOMVisualViewport* visualViewport() { return nullptr; }
 
     bool closed() const;
 
     // FIXME: This is not listed as a cross-origin accessible attribute, but in
     // Blink, it's currently marked as DoNotCheckSecurity.
     unsigned length() const;
 
     virtual const AtomicString& name() const = 0;
     virtual void setName(const AtomicString&) = 0;
 
@@ skipping 124 matching lines @@
     // implementation details to scripts.
     bool m_windowIsClosing;
 
 private:
     mutable Member<Location> m_location;
 };
 
 } // namespace blink
 
 #endif // DOMWindow_h