[DevTools] Blink-side APIs for device metrics emulation in content.

public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 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 384 matching lines @@
     virtual void inspectElementAt(const WebPoint&) = 0;
 
     // Settings used by the inspector.
     virtual WebString inspectorSettings() const = 0;
     virtual void setInspectorSettings(const WebString&) = 0;
     virtual bool inspectorSetting(const WebString& key,
                                   WebString* value) const = 0;
     virtual void setInspectorSetting(const WebString& key,
                                      const WebString& value) = 0;
 
+    // Set an override of device scale factor passed from WebView to
+    // compositor. Pass zero to cancel override. This is used to implement
+    // device metrics emulation.
+    virtual void setCompositorDeviceScaleFactorOverride(float) = 0;
+
+    // Set scaling transformation on the root composited layer. This is used
+    // to implement device metrics emulation.
+    virtual void setRootLayerScaleTransform(float) = 0;
+
     // The embedder may optionally engage a WebDevToolsAgent.  This may only
     // be set once per WebView.
     virtual WebDevToolsAgent* devToolsAgent() = 0;
 
 
     // Accessibility -------------------------------------------------------
 
     // Returns the accessibility object for this view.
     virtual WebAXObject accessibilityObject() = 0;
 
@@ skipping 104 matching lines @@
 
     // Testing functionality for TestRunner ---------------------------------
 
 protected:
     ~WebView() {}
 };
 
 } // namespace WebKit
 
 #endif