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

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 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 271 matching lines @@
         const WebPoint& screenPoint,
         int keyModifiers);
     virtual void spellingMarkers(WebVector<uint32_t>* markers);
     virtual unsigned long createUniqueIdentifierForRequest();
     virtual void inspectElementAt(const WebPoint& point);
     virtual WebString inspectorSettings() const;
     virtual void setInspectorSettings(const WebString& settings);
     virtual bool inspectorSetting(const WebString& key, WebString* value) const;
     virtual void setInspectorSetting(const WebString& key,
                                      const WebString& value);
+    virtual void setCompositorDeviceScaleFactorOverride(float);
+    virtual void setRootLayerScaleTransform(float);
     virtual WebDevToolsAgent* devToolsAgent();
     virtual WebAXObject accessibilityObject();
     virtual void applyAutofillSuggestions(
         const WebNode&,
         const WebVector<WebString>& names,
         const WebVector<WebString>& labels,
         const WebVector<WebString>& icons,
         const WebVector<int>& itemIDs,
         int separatorIndex);
     virtual void hidePopups();
@@ skipping 530 matching lines @@
 inline WebViewImpl* toWebViewImpl(WebView* webView)
 {
     // We have no ways to check if the specified WebView is an instance of
     // WebViewImpl because WebViewImpl is the only implementation of WebView.
     return static_cast<WebViewImpl*>(webView);
 }
 
 } // namespace WebKit
 
 #endif