DevTools: extract protocol module

third_party/WebKit/Source/devtools/front_end/layers/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 396 matching lines @@
   /**
    * @override
    * @param {function(!Array.<string>)} callback
    */
   requestCompositingReasons(callback) {
     if (!this._target) {
       callback([]);
       return;
     }
 
-    var wrappedCallback = InspectorBackend.wrapClientCallback(
+    var wrappedCallback = Protocol.inspectorBackend.wrapClientCallback(
         callback, 'Protocol.LayerTree.reasonsForCompositingLayer(): ', undefined, []);
     this._target.layerTreeAgent().compositingReasons(this.id(), wrappedCallback);
   }
 
   /**
    * @override
    * @return {boolean}
    */
   drawsContent() {
     return this._layerPayload.drawsContent;
@@ skipping 132 matching lines @@
 
   /**
    * @override
    * @param {!Protocol.LayerTree.LayerId} layerId
    * @param {!Protocol.DOM.Rect} clipRect
    */
   layerPainted(layerId, clipRect) {
     this._layerTreeModel._layerPainted(layerId, clipRect);
   }
 };