[DevTools] Extract part of DevTools into inspector app.

Source/devtools/front_end/host/InspectorFrontendHost.js

 /*
  * Copyright (C) 2009 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 610 matching lines @@
         return true;
     }
 };
 
 /**
  * @type {!InspectorFrontendHostAPI}
  */
 var InspectorFrontendHost = window.InspectorFrontendHost || null;
 
 (function() {
+    if (window.top) {
+        // FIXME(dgozman): use InspectorAppHost everywhere in inspector app instead of InspectorFrontendHost.
+        InspectorFrontendHost = window.top.InspectorFrontendHost || null;
+    }
     if (!InspectorFrontendHost) {
         // Instantiate stub for web-hosted mode if necessary.
         InspectorFrontendHost = new WebInspector.InspectorFrontendHostStub();
     } else {
         // Otherwise add stubs for missing methods that are declared in the interface.
         var proto = WebInspector.InspectorFrontendHostStub.prototype;
         for (var name in proto) {
             var value = proto[name];
             if (typeof value !== "function" || InspectorFrontendHost[name])
                 continue;
@@ skipping 61 matching lines @@
      * @param {number} id
      * @param {?string} error
      */
     embedderMessageAck: function(id, error)
     {
         InspectorFrontendHost["embedderMessageAck"](id, error);
     }
 }
 
 var InspectorFrontendAPI = new InspectorFrontendAPIImpl();