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

content/shell/shell_content_browser_client.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_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 26 matching lines @@
   virtual void GetAdditionalMappedFilesForChildProcess(
       const CommandLine& command_line,
       base::GlobalDescriptors::Mapping* mappings) OVERRIDE;
 #endif
 
   ShellBrowserContext* browser_context();
   ShellBrowserContext* off_the_record_browser_context();
   ShellResourceDispatcherHostDelegate* resource_dispatcher_host_delegate() {
     return resource_dispatcher_host_delegate_.get();
   }
+  ShellBrowserMainParts* shell_browser_main_parts() {
+    return shell_browser_main_parts_;
+  }
 
  private:
   scoped_ptr<ShellResourceDispatcherHostDelegate>
       resource_dispatcher_host_delegate_;
 
   ShellBrowserMainParts* shell_browser_main_parts_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_CONTENT_BROWSER_CLIENT_H_