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

Source/devtools/front_end/sdk/ResourceTreeModel.js

 /*
  * 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 53 matching lines @@
     ResourceAdded: "ResourceAdded",
     WillLoadCachedResources: "WillLoadCachedResources",
     CachedResourcesLoaded: "CachedResourcesLoaded",
     DOMContentLoaded: "DOMContentLoaded",
     Load: "Load",
     WillReloadPage: "WillReloadPage",
     InspectedURLChanged: "InspectedURLChanged",
     SecurityOriginAdded: "SecurityOriginAdded",
     SecurityOriginRemoved: "SecurityOriginRemoved",
     ScreencastFrame: "ScreencastFrame",
-    ScreencastVisibilityChanged: "ScreencastVisibilityChanged"
+    ScreencastVisibilityChanged: "ScreencastVisibilityChanged",
+    ViewportChanged: "ViewportChanged"
 }
 
 WebInspector.ResourceTreeModel.prototype = {
     _fetchResourceTree: function()
     {
         /** @type {!Object.<string, !WebInspector.ResourceTreeFrame>} */
         this._frames = {};
         delete this._cachedResourcesProcessed;
         this._agent.getResourceTree(this._processCachedResources.bind(this));
     },
@@ skipping 719 matching lines @@
     {
         this._resourceTreeModel.dispatchEventToListeners(WebInspector.ResourceTreeModel.EventTypes.ScreencastFrame, {data:data, metadata:metadata});
     },
 
     /**
      * @param {boolean} visible
      */
     screencastVisibilityChanged: function(visible)
     {
         this._resourceTreeModel.dispatchEventToListeners(WebInspector.ResourceTreeModel.EventTypes.ScreencastVisibilityChanged, {visible:visible});
+    },
+
+    /**
+     * @param {!PageAgent.Viewport=} viewport
+     */
+    viewportChanged: function(viewport)
+    {
+        this._resourceTreeModel.dispatchEventToListeners(WebInspector.ResourceTreeModel.EventTypes.ViewportChanged, viewport);
     }
 }
 
 /**
  * @type {!WebInspector.ResourceTreeModel}
  */
 WebInspector.resourceTreeModel;