Add ChromeVox panel and implement caption display functionality.

chrome/browser/resources/chromeos/chromevox/tools/check_chromevox.py

 #!/usr/bin/env python
 
 # Copyright 2014 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.
 
 '''Uses the closure compiler to check the ChromeVox javascript files.
 
 With no arguments, checks all ChromeVox scripts.  If any arguments are
 specified, only scripts that include any of the specified files will be
@@ skipping 44 matching lines @@
     _CHROME_EXTENSIONS_EXTERNS]
 
 # List of top-level scripts and externs that we can check.
 _TOP_LEVEL_SCRIPTS = [
     [[CVoxPath('chromevox/background/kbexplorer_loader.js')],
      [_CHROME_EXTENSIONS_EXTERNS]],
     [[CVoxPath('chromevox/background/loader.js')], _COMMON_EXTERNS],
     [[CVoxPath('chromevox/background/options_loader.js')], _COMMON_EXTERNS],
     [[CVoxPath('chromevox/injected/loader.js')], _COMMON_EXTERNS],
     [[CVoxPath('cvox2/background/loader.js')], _COMMON_EXTERNS],
+    [[CVoxPath('cvox2/background/panel_loader.js')], _COMMON_EXTERNS],
     ]
 
 
 def _Compile(js_files, externs):
   try:
     return RunCompiler(js_files, externs)
   except KeyboardInterrupt:
     return (False, 'KeyboardInterrupt')
 
 
@@ skipping 57 matching lines @@
   if len(args) > 0:
     changed_paths = (os.path.relpath(p) for p in args)
   success, output = CheckChromeVox(changed_paths)
   if len(output) > 0:
     print output
   return int(not success)
 
 
 if __name__ == '__main__':
   sys.exit(main())