Adds scroll position/scale emulation to DevTools.

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 26 matching lines @@
 #include "wtf/Noncopyable.h"
 #include "wtf/text/AtomicString.h"
 #include <memory>
 
 namespace blink {
 
 class ChromeClient;
 class ConsoleMessageStorage;
 class CustomElementReactionStack;
 class Deprecation;
+class DoublePoint;
 class EventHandlerRegistry;
+class IntPoint;
 class OverscrollController;
 class Page;
 struct PageScaleConstraints;
 class PageScaleConstraintsSet;
+class ScrollAndScaleEmulator;
 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 65 matching lines @@
     // recursive frameset pages can quickly bring the program to its knees
     // with exponential growth in the number of frames.
     static const int maxNumberOfFrames = 1000;
     void incrementSubframeCount() { ++m_subframeCount; }
     void decrementSubframeCount() { ASSERT(m_subframeCount); --m_subframeCount; }
     int subframeCount() const;
 
     void setDefaultPageScaleLimits(float minScale, float maxScale);
     void setUserAgentPageScaleConstraints(const PageScaleConstraints& newConstraints);
 
+    // Override the page scale and scroll positions of main frame and visual viewport.
+    void setScrollAndScaleOverride(const IntPoint& framePosition, const DoublePoint& visualViewportPosition, float pageScale);
+    void clearScrollAndScaleOverride();
+    ScrollAndScaleEmulator* scrollAndScaleEmulator() { return m_scrollAndScaleEmulator; }
+
 private:
     explicit FrameHost(Page&);
 
     const Member<Page> m_page;
     const Member<TopControls> m_topControls;
     const std::unique_ptr<PageScaleConstraintsSet> m_pageScaleConstraintsSet;
     const Member<VisualViewport> m_visualViewport;
     const Member<OverscrollController> m_overscrollController;
     const Member<EventHandlerRegistry> m_eventHandlerRegistry;
     const Member<ConsoleMessageStorage> m_consoleMessageStorage;
     const Member<CustomElementReactionStack> m_customElementReactionStack;
+    Member<ScrollAndScaleEmulator> m_scrollAndScaleEmulator;
 
     AtomicString m_overrideEncoding;
     int m_subframeCount;
 };
 
 } // namespace blink
 
 #endif // FrameHost_h