Migrates legacy packaged app data when it's upgraded to a platform app

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/diagnostics/diagnostics_api.cc',
       'browser/extensions/api/diagnostics/diagnostics_api.h',
       'browser/extensions/api/diagnostics/diagnostics_api_chromeos.cc',
@@ skipping 469 matching lines @@
       'browser/extensions/api/web_request/chrome_extension_web_request_event_router_delegate.h',
       'browser/extensions/api/web_view/chrome_web_view_internal_api.cc',
       'browser/extensions/api/web_view/chrome_web_view_internal_api.h',
       'browser/extensions/api/webrtc_audio_private/webrtc_audio_private_api.cc',
       'browser/extensions/api/webrtc_audio_private/webrtc_audio_private_api.h',
       'browser/extensions/api/webrtc_logging_private/webrtc_logging_private_api.h',
       'browser/extensions/api/webstore/webstore_api.cc',
       'browser/extensions/api/webstore/webstore_api.h',
       'browser/extensions/api/webstore_private/webstore_private_api.cc',
       'browser/extensions/api/webstore_private/webstore_private_api.h',
+      'browser/extensions/app_data_migrator.h',
+      'browser/extensions/app_data_migrator.cc',
       'browser/extensions/app_icon_loader.h',
       'browser/extensions/app_icon_loader_impl.cc',
       'browser/extensions/app_icon_loader_impl.h',
       'browser/extensions/app_sync_bundle.cc',
       'browser/extensions/app_sync_bundle.h',
       'browser/extensions/app_sync_data.cc',
       'browser/extensions/app_sync_data.h',
       'browser/extensions/blacklist.cc',
       'browser/extensions/blacklist.h',
       'browser/extensions/blacklist_state_fetcher.cc',
@@ skipping 607 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }