Add a private API method to install a webstore app from Files.app

chrome/chrome_browser_chromeos.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_chromeos',
       'type': 'static_library',
@@ skipping 322 matching lines @@
         'browser/chromeos/extensions/file_manager/file_tasks.cc',
         'browser/chromeos/extensions/file_manager/file_tasks.h',
         'browser/chromeos/extensions/file_manager/file_watcher.cc',
         'browser/chromeos/extensions/file_manager/file_watcher.h',
         'browser/chromeos/extensions/file_manager/fileapi_util.cc',
         'browser/chromeos/extensions/file_manager/fileapi_util.h',
         'browser/chromeos/extensions/file_manager/mounted_disk_monitor.cc',
         'browser/chromeos/extensions/file_manager/mounted_disk_monitor.h',
         'browser/chromeos/extensions/file_manager/url_util.cc',
         'browser/chromeos/extensions/file_manager/url_util.h',
+        'browser/chromeos/extensions/file_manager/webstore_app_installer.cc',
+        'browser/chromeos/extensions/file_manager/webstore_app_installer.h',
         'browser/chromeos/extensions/file_manager/zip_file_creator.cc',
         'browser/chromeos/extensions/file_manager/zip_file_creator.h',
         'browser/chromeos/extensions/info_private_api.cc',
         'browser/chromeos/extensions/info_private_api.h',
         'browser/chromeos/extensions/input_method_event_router.cc',
         'browser/chromeos/extensions/input_method_event_router.h',
         'browser/chromeos/extensions/install_limiter.cc',
         'browser/chromeos/extensions/install_limiter.h',
         'browser/chromeos/extensions/install_limiter_factory.cc',
         'browser/chromeos/extensions/install_limiter_factory.h',
@@ skipping 618 matching lines @@
         'browser/chromeos/attestation/attestation_key_payload.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }