FileAPI: Factor out getting root URI and FS name parts into each FS backend

webkit/browser/fileapi/test_file_system_backend.cc

 // Copyright (c) 2012 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 "webkit/browser/fileapi/test_file_system_backend.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 86 matching lines @@
 
 bool TestFileSystemBackend::CanHandleType(FileSystemType type) const {
   return (type == kFileSystemTypeTest);
 }
 
 void TestFileSystemBackend::OpenFileSystem(
     const GURL& origin_url,
     FileSystemType type,
     OpenFileSystemMode mode,
     const OpenFileSystemCallback& callback) {
-  callback.Run(base::PLATFORM_FILE_OK);
+  callback.Run(GetFileSystemRootURI(origin_url, type),
+               GetFileSystemName(origin_url, type),
+               base::PLATFORM_FILE_OK);
 }
 
 FileSystemFileUtil* TestFileSystemBackend::GetFileUtil(FileSystemType type) {
   DCHECK(local_file_util_.get());
   return local_file_util_->sync_file_util();
 }
 
 AsyncFileUtil* TestFileSystemBackend::GetAsyncFileUtil(FileSystemType type) {
   return local_file_util_.get();
 }
@@ skipping 63 matching lines @@
 }
 
 void TestFileSystemBackend::AddFileChangeObserver(
     FileChangeObserver* observer) {
   ChangeObserverList::Source source = change_observers_.source();
   source.AddObserver(observer, task_runner_.get());
   change_observers_ = ChangeObserverList(source);
 }
 
 }  // namespace fileapi