Add remoting and PPAPI tests to GN build

remoting/remoting_locales.gypi

 # Copyright 2015 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.
 
 {
   'variables': {
     'remoting_localize_path': 'tools/build/remoting_localize.py',
 
     'webapp_locale_dir': '<(SHARED_INTERMEDIATE_DIR)/remoting/webapp/_locales',
 
     'remoting_locales': [
-      # Note: list duplicated in GN build. See //remoting/resources/BUILD.gn
+      # Note: list duplicated in GN build. See //remoting/remoting_locales.gni
       'ar', 'bg', 'ca', 'cs', 'da', 'de', 'el', 'en', 'en-GB', 'es',
       'es-419', 'et', 'fi', 'fil', 'fr', 'he', 'hi', 'hr', 'hu', 'id',
       'it', 'ja', 'ko', 'lt', 'lv', 'nb', 'nl', 'pl', 'pt-BR', 'pt-PT',
       'ro', 'ru', 'sk', 'sl', 'sr', 'sv', 'th', 'tr', 'uk', 'vi',
       'zh-CN', 'zh-TW',
     ],
     'remoting_webapp_locale_files': [
       # Build the list of .json files generated from remoting_strings.grd.
       '<!@pymod_do_main(remoting_localize --locale_output '
           '"<(webapp_locale_dir)/@{json_suffix}/messages.json" '
           '--print_only <(remoting_locales))',
     ],
   },  # variables
 }