Implement async verision of FileSystemFileUtil and in-memory file system for testing purposes.

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',
       '../../glue/resources/pan_east.cur',
       '../../glue/resources/pan_middle.cur',
@@ skipping 488 matching lines @@
             '<(DEPTH)/build/linux/system.gyp:gtk',
           ],
           'sources!': [
              # TODO(port)
             '../../../skia/ext/platform_canvas_unittest.cc',
           ],
         }],
         ['chromeos==1', {
           'sources': [
             '../../chromeos/fileapi/file_access_permissions_unittest.cc',
+            '../../chromeos/fileapi/memory_file_util.cc',
+            '../../chromeos/fileapi/memory_file_util.h',
+            '../../chromeos/fileapi/memory_file_util_unittest.cc',
           ],
         }],
         ['OS=="mac"', {
           # mac tests load the resources from the built test_shell beside the
           # test
           'dependencies': [
             'test_shell',
            ],
           'sources!': [
             # Disable the image decoder tests because we use CoreGraphics
@@ skipping 237 matching lines @@
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
             ],
           },
         },
       ],
     }],
   ],
 }