Use rewriting to make ChromeOS keyboard F<number> keys produce extended keycodes.

chrome/browser/ui/ash/chrome_shell_delegate.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 "chrome/browser/ui/ash/chrome_shell_delegate.h"
 
 #include "ash/launcher/launcher_types.h"
 #include "ash/magnifier/magnifier_constants.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/wm/stacking_controller.h"
@@ skipping 521 matching lines @@
   return new ash::StackingController;
 }
 
 bool ChromeShellDelegate::IsSearchKeyActingAsFunctionKey() const {
 #if defined(OS_CHROMEOS)
   bool chromebook_function_key = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableChromebookFunctionKey);
   if (!chromebook_function_key)
     return false;
 
+  bool chromeos_keyboard = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kHasChromeOSKeyboard);
+  if (!chromeos_keyboard)
+    return false;
+
   Profile* profile = ProfileManager::GetDefaultProfile();
   return profile->GetPrefs()->GetBoolean(
       prefs::kLanguageSearchKeyActsAsFunctionKey);
 #else
   return false;
 #endif
 }
 
 void ChromeShellDelegate::Observe(int type,
                                   const content::NotificationSource& source,
                                   const content::NotificationDetails& details) {
 #if defined(OS_CHROMEOS)
   switch (type) {
     case chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED:
       ash::Shell::GetInstance()->CreateLauncher();
       break;
     case chrome::NOTIFICATION_SESSION_STARTED:
       ash::Shell::GetInstance()->ShowLauncher();
       break;
     default:
       NOTREACHED() << "Unexpected notification " << type;
   }
 #else
   // MSVC++ warns about switch statements without any cases.
   NOTREACHED() << "Unexpected notification " << type;
 #endif
 }