[ew] Add basic classes.

chrome/browser/media_galleries/fileapi/media_file_system_backend.cc

 // 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.
 
 #include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"
 
 #include <string>
+#include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 244 matching lines @@
 #if defined(OS_MACOSX)
     case storage::kFileSystemTypeIphoto:
       return iphoto_file_util_.get();
 #endif  // defined(OS_MACOSX)
     default:
       NOTREACHED();
   }
   return NULL;
 }
 
+storage::WatcherManager* MediaFileSystemBackend::GetWatcherManager(
+    storage::FileSystemType type) {
+  return NULL;
+}
+
 storage::CopyOrMoveFileValidatorFactory*
 MediaFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     storage::FileSystemType type,
     base::File::Error* error_code) {
   DCHECK(error_code);
   *error_code = base::File::FILE_OK;
   switch (type) {
     case storage::kFileSystemTypeNativeMedia:
     case storage::kFileSystemTypeDeviceMedia:
     case storage::kFileSystemTypeIphoto:
@@ skipping 73 matching lines @@
           context->default_file_task_runner(),
           url.path(),
           offset,
           storage::FileStreamWriter::OPEN_EXISTING_FILE));
 }
 
 storage::FileSystemQuotaUtil* MediaFileSystemBackend::GetQuotaUtil() {
   // No quota support.
   return NULL;
 }