Add a minimal AttachmentUploaderImpl.

sync/sync_tests.gypi

 # 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.
 
 {
   'targets': [
     # Test support files for the 'sync_core' target.
     {
       'target_name': 'test_support_sync_core',
       'type': 'static_library',
@@ skipping 406 matching lines @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         'sync',
         'test_support_sync_internal_api',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
         'sources': [
+          'internal_api/attachments/attachment_uploader_impl_unittest.cc',
           'internal_api/attachments/fake_attachment_store_unittest.cc',
           'internal_api/attachments/fake_attachment_uploader_unittest.cc',
           'internal_api/debug_info_event_listener_unittest.cc',
           'internal_api/http_bridge_unittest.cc',
           'internal_api/js_mutation_event_observer_unittest.cc',
           'internal_api/js_sync_encryption_handler_observer_unittest.cc',
           'internal_api/js_sync_manager_observer_unittest.cc',
           'internal_api/protocol_event_buffer_unittest.cc',
           'internal_api/public/change_record_unittest.cc',
           'internal_api/public/sessions/sync_session_snapshot_unittest.cc',
@@ skipping 250 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'sync_unit_tests',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }