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

content/shell/shell_win.cc

 // 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.
 
 #include "content/shell/shell.h"
 
 #include <commctrl.h>
 #include <fcntl.h>
 #include <io.h>
 #include <windows.h>
@@ skipping 218 matching lines @@
           CreateNewWindow(
               shell->web_contents()->GetBrowserContext(),
               GURL(), NULL, MSG_ROUTING_NONE, NULL);
           break;
         case IDM_CLOSE_WINDOW:
           DestroyWindow(hwnd);
           break;
         case IDM_EXIT:
           PlatformExit();
           break;
+        case IDM_SHOW_DEVELOPER_TOOLS:
+          shell->ShowDevTools();
+          break;
         case IDC_NAV_BACK:
           shell->GoBackOrForward(-1);
           break;
         case IDC_NAV_FORWARD:
           shell->GoBackOrForward(1);
           break;
         case IDC_NAV_RELOAD:
           shell->Reload();
           break;
         case IDC_NAV_STOP:
@@ skipping 51 matching lines @@
 
   return CallWindowProc(shell->default_edit_wnd_proc_, hwnd, message, wParam,
                         lParam);
 }
 
 void Shell::PlatformSetTitle(const string16& text) {
   ::SetWindowText(window_, text.c_str());
 }
 
 }  // namespace content