Make Isolated file system writable only if it is configured so

webkit/fileapi/sandbox_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/sandbox_mount_point_provider.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/rand_util.h"
 #include "base/sequenced_task_runner.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/net_util.h"
 #include "webkit/fileapi/file_system_file_stream_reader.h"
 #include "webkit/fileapi/file_system_operation.h"
 #include "webkit/fileapi/file_system_operation_context.h"
 #include "webkit/fileapi/file_system_options.h"
 #include "webkit/fileapi/file_system_types.h"
 #include "webkit/fileapi/file_system_usage_cache.h"
 #include "webkit/fileapi/file_system_util.h"
 #include "webkit/fileapi/native_file_util.h"
 #include "webkit/fileapi/obfuscated_file_util.h"
+#include "webkit/fileapi/sandbox_file_stream_writer.h"
 #include "webkit/glue/webkit_glue.h"
 #include "webkit/quota/quota_manager.h"
 
 using quota::QuotaManagerProxy;
 
 namespace fileapi {
 
 namespace {
 
 const char kChromeScheme[] = "chrome";
@@ skipping 417 matching lines @@
     const GURL& url,
     int64 offset,
     FileSystemContext* context) const {
   return new FileSystemFileStreamReader(context, url, offset);
 }
 
 fileapi::FileStreamWriter* SandboxMountPointProvider::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* SandboxMountPointProvider::GetQuotaUtil() {
   return this;
 }
 
 FilePath SandboxMountPointProvider::old_base_path() const {
   return profile_path_.Append(kOldFileSystemDirectory);
 }
 
@@ skipping 263 matching lines @@
       break;
     case base::PLATFORM_FILE_ERROR_FAILED:
     default:
       REPORT(kUnknownError);
       break;
   }
 #undef REPORT
 }
 
 }  // namespace fileapi