Update AttachmentServiceImpl to retry attachment uploads.

sync/sync.gyp

 # Copyright 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': {
     'chromium_code': 1,
   },
 
   'includes': [
@@ skipping 151 matching lines @@
         'internal_api/attachments/attachment_downloader.cc',
         'internal_api/attachments/attachment_downloader_impl.cc',
         'internal_api/attachments/attachment_service.cc',
         'internal_api/attachments/attachment_service_impl.cc',
         'internal_api/attachments/attachment_service_proxy.cc',
         'internal_api/attachments/attachment_service_proxy_for_test.cc',
         'internal_api/attachments/attachment_uploader.cc',
         'internal_api/attachments/attachment_uploader_impl.cc',
         'internal_api/attachments/fake_attachment_downloader.cc',
         'internal_api/attachments/fake_attachment_uploader.cc',
+        'internal_api/attachments/task_queue.cc',
         'internal_api/base_node.cc',
         'internal_api/base_transaction.cc',
         'internal_api/change_record.cc',
         'internal_api/change_reorder_buffer.cc',
         'internal_api/change_reorder_buffer.h',
         'internal_api/debug_info_event_listener.cc',
         'internal_api/debug_info_event_listener.h',
         'internal_api/delete_journal.cc',
         'internal_api/events/commit_request_event.cc',
         'internal_api/events/commit_response_event.cc',
@@ skipping 16 matching lines @@
         'internal_api/attachments/public/attachment_downloader.h',
         'internal_api/attachments/public/attachment_service.h',
         'internal_api/attachments/public/attachment_service_impl.h',
         'internal_api/attachments/public/attachment_service_proxy_for_test.h',
         'internal_api/attachments/public/attachment_service_proxy.h',
         'internal_api/attachments/public/attachment_uploader.h',
         'internal_api/public/attachments/attachment_downloader_impl.h',
         'internal_api/public/attachments/attachment_uploader_impl.h',
         'internal_api/public/attachments/fake_attachment_downloader.h',
         'internal_api/public/attachments/fake_attachment_uploader.h',
+        'internal_api/public/attachments/task_queue.h',
         'internal_api/public/base/attachment_id_proto.cc',
         'internal_api/public/base/attachment_id_proto.h',
         'internal_api/public/base/cancelation_observer.cc',
         'internal_api/public/base/cancelation_observer.h',
         'internal_api/public/base/cancelation_signal.cc',
         'internal_api/public/base/cancelation_signal.h',
         'internal_api/public/base/enum_set.h',
         'internal_api/public/base/enum_set.h',
         'internal_api/public/base/invalidation_interface.cc',
         'internal_api/public/base/invalidation_interface.h',
@@ skipping 286 matching lines @@
         'proto_out_dir': 'sync/protocol',
         'cc_generator_options': 'dllexport_decl=SYNC_PROTO_EXPORT:',
         'cc_include': 'sync/protocol/sync_proto_export.h',
       },
       'includes': [
         '../build/protoc.gypi'
       ],
     },
   ],
 }