Add a menu item to content_shell to open devtools to make it more discoverable.

content/public/browser/devtools_http_handler.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 CONTENT_PUBLIC_BROWSER_DEVTOOLS_HTTP_HANDLER_H_
 #define CONTENT_PUBLIC_BROWSER_DEVTOOLS_HTTP_HANDLER_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
 
+class GURL;
+
 namespace net {
 class StreamListenSocketFactory;
 class URLRequestContextGetter;
 }
 
 namespace content {
 
 class DevToolsHttpHandlerDelegate;
 class RenderViewHost;
 
@@ skipping 27 matching lines @@
       DevToolsHttpHandlerDelegate* delegate);
 
   // Called from the main thread in order to stop protocol handler.
   // Automatically destroys the handler instance.
   virtual void Stop() = 0;
 
   // Set the RenderViewHostBinding instance. If no instance is provided the
   // default implementation will be used.
   virtual void SetRenderViewHostBinding(RenderViewHostBinding* binding) = 0;
 
+  // Returns the URL for the address to debug |render_view_host|.
+  virtual GURL GetFrontendURL(RenderViewHost* render_view_host) = 0;
+
  protected:
   virtual ~DevToolsHttpHandler() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_HTTP_HANDLER_H_