[DevTools] Use device metrics emulation implemented in content.

Source/core/page/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 135 matching lines @@
     void adjustViewSize();
 
     virtual IntRect windowClipRect(bool clipToContents = true) const;
     IntRect windowClipRectForFrameOwner(const HTMLFrameOwnerElement*, bool clipToLayerContents) const;
 
     virtual IntRect windowResizerRect() const;
 
     virtual float visibleContentScaleFactor() const OVERRIDE { return m_visibleContentScaleFactor; }
     void setVisibleContentScaleFactor(float);
 
+    virtual float inputEventsScaleFactor() const OVERRIDE;
+    void setInputEventsScaleFactorForEmulation(float);
+
     virtual void setScrollPosition(const IntPoint&) OVERRIDE;
     virtual void repaintFixedElementsAfterScrolling();
     virtual void updateFixedElementsAfterScrolling();
     virtual bool shouldRubberBandInDirection(ScrollDirection) const;
     virtual bool requestScrollPositionUpdate(const IntPoint&) OVERRIDE;
     virtual bool isRubberBandInProgress() const OVERRIDE;
     void setScrollPositionNonProgrammatically(const IntPoint&);
 
     // This is different than visibleContentRect() in that it ignores negative (or overly positive)
     // offsets from rubber-banding, and it takes zooming into account.
@@ skipping 367 matching lines @@
     OwnPtr<ViewportConstrainedObjectSet> m_viewportConstrainedObjects;
 
     static double s_normalDeferredRepaintDelay;
     static double s_initialDeferredRepaintDelayDuringLoading;
     static double s_maxDeferredRepaintDelayDuringLoading;
     static double s_deferredRepaintDelayIncrementDuringLoading;
 
     bool m_hasSoftwareFilters;
 
     float m_visibleContentScaleFactor;
+    float m_inputEventsScaleFactorForEmulation;
 
     PartialLayoutState m_partialLayout;
 };
 
 inline void FrameView::incrementVisuallyNonEmptyCharacterCount(unsigned count)
 {
     if (m_isVisuallyNonEmpty)
         return;
     m_visuallyNonEmptyCharacterCount += count;
     // Use a threshold value to prevent very small amounts of visible content from triggering didFirstVisuallyNonEmptyLayout.
@@ skipping 25 matching lines @@
     ASSERT(!widget || widget->isFrameView());
     return static_cast<const FrameView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toFrameView(const FrameView*);
 
 } // namespace WebCore
 
 #endif // FrameView_h