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

content/shell/shell_devtools_delegate.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_SHELL_SHELL_DEVTOOLS_DELEGATE_H_
 #define CONTENT_SHELL_SHELL_DEVTOOLS_DELEGATE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/public/browser/devtools_http_handler_delegate.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace content {
 
 class DevToolsHttpHandler;
 
 class ShellDevToolsDelegate : public DevToolsHttpHandlerDelegate {
  public:
-  ShellDevToolsDelegate(int port, net::URLRequestContextGetter* context_getter);
+  explicit ShellDevToolsDelegate(net::URLRequestContextGetter* context_getter);
   virtual ~ShellDevToolsDelegate();
 
   // Stops http server.
   void Stop();
 
   // DevToolsHttpProtocolHandler::Delegate overrides.
   virtual std::string GetDiscoveryPageHTML() OVERRIDE;
   virtual bool BundlesFrontendResources() OVERRIDE;
   virtual std::string GetFrontendResourcesBaseURL() OVERRIDE;
 
+  DevToolsHttpHandler* devtools_http_handler() {
+    return devtools_http_handler_;
+  }
+
  private:
   net::URLRequestContextGetter* context_getter_;
   DevToolsHttpHandler* devtools_http_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDevToolsDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_DEVTOOLS_DELEGATE_H_