Make Isolated file system writable only if it is configured so

webkit/fileapi/test_mount_point_provider.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/fileapi/test_mount_point_provider.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/sequenced_task_runner.h"
 #include "webkit/fileapi/file_system_file_stream_reader.h"
 #include "webkit/fileapi/file_system_operation.h"
 #include "webkit/fileapi/file_system_quota_util.h"
 #include "webkit/fileapi/file_system_util.h"
 #include "webkit/fileapi/local_file_util.h"
 #include "webkit/fileapi/native_file_util.h"
+#include "webkit/fileapi/sandbox_file_stream_writer.h"
 #include "webkit/quota/quota_manager.h"
 
 namespace fileapi {
 
 namespace {
 
 // This only supports single origin.
 class TestFileSystemQuotaUtil : public FileSystemQuotaUtil {
  public:
   explicit TestFileSystemQuotaUtil(base::SequencedTaskRunner* task_runner)
@@ skipping 120 matching lines @@
     const GURL& url,
     int64 offset,
     FileSystemContext* context) const {
   return new FileSystemFileStreamReader(context, url, offset);
 }
 
 fileapi::FileStreamWriter* TestMountPointProvider::CreateFileStreamWriter(
     const GURL& url,
     int64 offset,
     FileSystemContext* context) const {
-  // TODO(kinaba,kinuko): return SandboxFileWriter when it is implemented.
-  NOTIMPLEMENTED();
-  return NULL;
+  return new SandboxFileStreamWriter(context, url, offset);
 }
 
 FileSystemQuotaUtil* TestMountPointProvider::GetQuotaUtil() {
   return quota_util_.get();
 }
 
 }  // namespace fileapi