[DevTools] Use device metrics emulation implemented in content.

Source/web/WebFrameImpl.h

 /*
  * Copyright (C) 2009 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 280 matching lines @@
     void didFail(const WebCore::ResourceError&, bool wasProvisional);
 
     // Sets whether the WebFrameImpl allows its document to be scrolled.
     // If the parameter is true, allow the document to be scrolled.
     // Otherwise, disallow scrolling.
     void setCanHaveScrollbars(bool);
 
     WebFrameClient* client() const { return m_client; }
     void setClient(WebFrameClient* client) { m_client = client; }
 
+    void setInputEventsScaleFactorForEmulation(float);
+
     static void selectWordAroundPosition(WebCore::Frame*, WebCore::VisiblePosition);
 
 private:
     class DeferredScopeStringMatches;
     friend class DeferredScopeStringMatches;
     friend class FrameLoaderClientImpl;
 
     struct FindMatch {
         RefPtr<WebCore::Range> m_range;
 
@@ skipping 177 matching lines @@
     // Valid between calls to BeginPrint() and EndPrint(). Containts the print
     // information. Is used by PrintPage().
     OwnPtr<ChromePrintContext> m_printContext;
 
     // The identifier of this frame.
     long long m_identifier;
 
     // Ensure we don't overwrite valid history data during same document loads
     // from HistoryItems
     bool m_inSameDocumentHistoryLoad;
+
+    // Stores the additional input evetns scale when device metrics emulation is enabled.
+    float m_inputEventsScaleFactorForEmulation;
 };
 
 inline WebFrameImpl* toWebFrameImpl(WebFrame* webFrame)
 {
     return static_cast<WebFrameImpl*>(webFrame);
 }
 
 inline const WebFrameImpl* toWebFrameImpl(const WebFrame* webFrame)
 {
     return static_cast<const WebFrameImpl*>(webFrame);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toWebFrameImpl(const WebFrameImpl*);
 
 } // namespace WebKit
 
 #endif