[DevTools] Use InspectorFrontendHost.readyForTest for layout tests.

chrome/browser/devtools/devtools_window.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVTOOLS_WINDOW_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_WINDOW_H_
 
 #include "base/macros.h"
 #include "chrome/browser/devtools/devtools_contents_resizing_strategy.h"
 #include "chrome/browser/devtools/devtools_toggle_action.h"
@@ skipping 320 matching lines @@
   bool is_docked_;
   const bool can_dock_;
   LifeStage life_stage_;
   DevToolsToggleAction action_on_load_;
   DevToolsContentsResizingStrategy contents_resizing_strategy_;
   // True if we're in the process of handling a beforeunload event originating
   // from the inspected webcontents, see InterceptPageBeforeUnload for details.
   bool intercepted_page_beforeunload_;
   base::Closure load_completed_callback_;
   base::Closure close_callback_;
+  bool ready_for_test_;
   base::Closure ready_for_test_callback_;
 
   base::TimeTicks inspect_element_start_time_;
   scoped_ptr<DevToolsEventForwarder> event_forwarder_;
 
   friend class DevToolsEventForwarder;
   DISALLOW_COPY_AND_ASSIGN(DevToolsWindow);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_WINDOW_H_