Add functionality to download files from GCS, and include them in the Chromoting isolate.

testing/chromoting/chromoting_integration_tests.isolate

 # Copyright (c) 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.
 {
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           './browser_tests_launcher.py',
           '--commands_file',
@@ skipping 16 matching lines @@
           '<(PRODUCT_DIR)/libosmesa.so',
           '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
           '../../remoting/tools/internal/test-account-host-config.json',
           '<(PRODUCT_DIR)/remoting/com.google.chrome.remote_desktop.json',
           '<(PRODUCT_DIR)/remoting/com.google.chrome.remote_assistance.json',
           '<(PRODUCT_DIR)/remoting-me2me-host.deb',
           '<(PRODUCT_DIR)/nacl_helper',
           '<(PRODUCT_DIR)/nacl_helper_bootstrap',
           '<(PRODUCT_DIR)/pnacl/',
           '../../remoting/internal/config/',
+          './test_accounts.json'
         ],
       },
     }],
     ['OS=="linux" and use_ozone==0', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
@@ skipping 71 matching lines @@
           '<(PRODUCT_DIR)/kasko.dll',
         ],
       },
     }],
   ],
   'includes': [
     '../../base/base.isolate',
     '../../gin/v8.isolate',
   ],
 }