DevTools: Add showing viewport for Layers3DView.

Source/devtools/front_end/sdk/LayerTreeModel.js

 /*
  * Copyright (C) 2013 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 233 matching lines @@
                 for (var i = 0; i < requestedNodeIds.length; ++i) {
                     var nodeId = nodeIds[i];
                     if (nodeId)
                         this._backendNodeIdToNodeId[requestedNodeIds[i]] = nodeId;
                 }
             }
             callback();
         }
     },
 
+    /**
+     * @param {!Object} viewportSize
+     */
+    setViewportSize: function(viewportSize)
+    {
+        this._viewportSize = viewportSize;
+    },
+
+    /**
+     * @return {!Object | undefined}
+     */
+    viewportSize: function()
+    {
+        return this._viewportSize;
+    },
+
     __proto__: WebInspector.TargetAwareObject.prototype
 };
 
 /**
   * @constructor
   * @extends {WebInspector.LayerTreeBase}
   * @param {!WebInspector.Target} target
   */
 WebInspector.TracingLayerTree = function(target)
 {
@@ skipping 847 matching lines @@
     },
 
     __proto__: WebInspector.DeferredLayerTree.prototype
 };
 
 /**
  * @constructor
  * @extends {WebInspector.DeferredLayerTree}
  * @param {!WebInspector.Target} target
  * @param {!WebInspector.TracingLayerPayload} root
+ * @param {!Object} viewportSize
  */
-WebInspector.DeferredTracingLayerTree = function(target, root)
+WebInspector.DeferredTracingLayerTree = function(target, root, viewportSize)
 {
     WebInspector.DeferredLayerTree.call(this, target);
     this._root = root;
+    this._viewportSize = viewportSize;
 }
 
 WebInspector.DeferredTracingLayerTree.prototype = {
     /**
      * @param {function(!WebInspector.LayerTreeBase)} callback
      */
     resolve: function(callback)
     {
         var result = new WebInspector.TracingLayerTree(this._target);
+        result.setViewportSize(this._viewportSize);
         result.setLayers(this._root, callback.bind(null, result));
     },
 
     __proto__: WebInspector.DeferredLayerTree.prototype
 };
 
 /**
  * @constructor
  * @implements {LayerTreeAgent.Dispatcher}
  * @param {!WebInspector.LayerTreeModel} layerTreeModel
@@ skipping 14 matching lines @@
 
     /**
      * @param {!LayerTreeAgent.LayerId} layerId
      * @param {!DOMAgent.Rect} clipRect
      */
     layerPainted: function(layerId, clipRect)
     {
         this._layerTreeModel._layerPainted(layerId, clipRect);
     }
 }