Add 1st cut of FileSystemUsageTracker that tracks the usage changes in FileSystem API.

webkit/tools/test_shell/test_shell.gypi

 # Copyright (c) 2011 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': {
     'test_shell_windows_resource_files': [
       'resources/test_shell.rc',
       'resources/pan_east.cur',
       'resources/pan_middle.cur',
@@ skipping 360 matching lines @@
         '../../blob/blob_storage_controller_unittest.cc',
         '../../blob/blob_url_request_job_unittest.cc',
         '../../blob/deletable_file_reference_unittest.cc',
         '../../database/databases_table_unittest.cc',
         '../../database/database_tracker_unittest.cc',
         '../../database/database_util_unittest.cc',
         '../../database/quota_table_unittest.cc',
         '../../fileapi/file_system_operation_unittest.cc',
         '../../fileapi/file_system_path_manager_unittest.cc',
         '../../fileapi/file_system_quota_manager_unittest.cc',
+        '../../fileapi/file_system_usage_tracker_unittest.cc',
         '../../fileapi/webfilewriter_base_unittest.cc',
         '../../glue/bookmarklet_unittest.cc',
         '../../glue/context_menu_unittest.cc',
         '../../glue/cpp_bound_class_unittest.cc',
         '../../glue/cpp_variant_unittest.cc',
         '../../glue/dom_operations_unittest.cc',
         '../../glue/dom_serializer_unittest.cc',
         '../../glue/glue_serialize_unittest.cc',
         '../../glue/iframe_redirect_unittest.cc',
         '../../glue/media/buffered_data_source_unittest.cc',
@@ skipping 338 matching lines @@
       ],
     }],
   ],
 }
 
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