[DevTools] Expose DevToolsAgentHost for OOPIF, display it in chrome://inspect.

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 "chrome/browser/devtools/devtools_contents_resizing_strategy.h"
 #include "chrome/browser/devtools/devtools_toggle_action.h"
 #include "chrome/browser/devtools/devtools_ui_bindings.h"
@@ skipping 54 matching lines @@
 
   // Open or reveal DevTools window, and perform the specified action.
   static DevToolsWindow* OpenDevToolsWindow(
       content::WebContents* inspected_web_contents,
       const DevToolsToggleAction& action);
 
   // Open or reveal DevTools window, with no special action.
   static DevToolsWindow* OpenDevToolsWindow(
       content::WebContents* inspected_web_contents);
 
+  // Open or reveal DevTools window. This window will be undocked.
+  static DevToolsWindow* OpenDevToolsWindow(
+      Profile* profile,
+      const scoped_refptr<content::DevToolsAgentHost>& agent_host);
+
   // Perform specified action for current WebContents inside a |browser|.
   // This may close currently open DevTools window.
   static DevToolsWindow* ToggleDevToolsWindow(
       Browser* browser,
       const DevToolsToggleAction& action);
 
   // External frontend is always undocked.
   static void OpenExternalFrontend(
       Profile* profile,
       const std::string& frontend_uri,
@@ skipping 224 matching lines @@
   base::Closure close_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_