[DevTools] Switch from DIP to CSS pixels in device mode.

Source/core/inspector/InspectorController.h

 /*
  * Copyright (C) 2011 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 89 matching lines @@
 
     void inspect(Node*);
     void drawHighlight(GraphicsContext&) const;
 
     bool handleGestureEvent(LocalFrame*, const PlatformGestureEvent&);
     bool handleMouseEvent(LocalFrame*, const PlatformMouseEvent&);
     bool handleTouchEvent(LocalFrame*, const PlatformTouchEvent&);
     bool handleKeyboardEvent(LocalFrame*, const PlatformKeyboardEvent&);
 
     void requestPageScaleFactor(float scale, const IntPoint& origin);
+    void deviceOrPageScaleFactorChanged();
     bool deviceEmulationEnabled();
 
     bool isUnderTest();
     void evaluateForTestInFrontend(long callId, const String& script);
 
     void resume();
 
     void setResourcesDataSizeLimitsFromInternals(int maximumResourcesContentSize, int maximumSingleResourceContentSize);
 
     void willProcessTask();
@@ skipping 41 matching lines @@
     InspectorAgentRegistry m_agents;
     bool m_isUnderTest;
     bool m_deferredAgentsInitialized;
     String m_hostId;
 };
 
 }
 
 
 #endif // !defined(InspectorController_h)