Implementing document.setRootScroller API for main thread scrolling.

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

 /*
  * Copyright (C) 2013 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 namespace blink {
 
 class ChromeClient;
 class ConsoleMessageStorage;
 class Deprecation;
 class EventHandlerRegistry;
 class OverscrollController;
 class Page;
 struct PageScaleConstraints;
 class PageScaleConstraintsSet;
+class RootScroller;
 class Settings;
 class TopControls;
 class UseCounter;
 class Visitor;
 class VisualViewport;
 
 // FrameHost is the set of global data shared between multiple frames
 // and is provided by the embedder to each frame when created.
 // FrameHost currently corresponds to the Page object in core/page
 // however the concept of a Page is moving up out of Blink.
@@ skipping 22 matching lines @@
     const UseCounter& useCounter() const;
 
     Deprecation& deprecation();
     const Deprecation& deprecation() const;
 
     // Corresponds to pixel density of the device where this Page is
     // being displayed. In multi-monitor setups this can vary between pages.
     // This value does not account for Page zoom, use LocalFrame::devicePixelRatio instead.
     float deviceScaleFactor() const;
 
+    RootScroller* rootScroller();
+    const RootScroller* rootScroller() const;
+
     TopControls& topControls();
     const TopControls& topControls() const;
 
     OverscrollController& overscrollController();
     const OverscrollController& overscrollController() const;
 
     VisualViewport& visualViewport();
     const VisualViewport& visualViewport() const;
 
     PageScaleConstraintsSet& pageScaleConstraintsSet();
@@ skipping 19 matching lines @@
     void decrementSubframeCount() { ASSERT(m_subframeCount); --m_subframeCount; }
     int subframeCount() const;
 
     void setDefaultPageScaleLimits(float minScale, float maxScale);
     void setUserAgentPageScaleConstraints(const PageScaleConstraints& newConstraints);
 
 private:
     explicit FrameHost(Page&);
 
     const Member<Page> m_page;
+    const Member<RootScroller> m_rootScroller;
     const Member<TopControls> m_topControls;
     const OwnPtr<PageScaleConstraintsSet> m_pageScaleConstraintsSet;
     const Member<VisualViewport> m_visualViewport;
     const Member<OverscrollController> m_overscrollController;
     const Member<EventHandlerRegistry> m_eventHandlerRegistry;
     const Member<ConsoleMessageStorage> m_consoleMessageStorage;
 
     AtomicString m_overrideEncoding;
     int m_subframeCount;
 };
 
 } // namespace blink
 
 #endif // FrameHost_h