Add Transient FileSystem which goes away after its snapsot file is gone

webkit/fileapi/isolated_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/isolated_mount_point_provider.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "base/platform_file.h"
 #include "base/sequenced_task_runner.h"
 #include "webkit/blob/local_file_stream_reader.h"
 #include "webkit/fileapi/async_file_util_adapter.h"
 #include "webkit/fileapi/copy_or_move_file_validator.h"
 #include "webkit/fileapi/file_system_callback_dispatcher.h"
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_file_stream_reader.h"
 #include "webkit/fileapi/file_system_operation_context.h"
 #include "webkit/fileapi/file_system_task_runners.h"
 #include "webkit/fileapi/file_system_types.h"
 #include "webkit/fileapi/file_system_util.h"
 #include "webkit/fileapi/isolated_context.h"
 #include "webkit/fileapi/isolated_file_util.h"
 #include "webkit/fileapi/local_file_stream_writer.h"
 #include "webkit/fileapi/local_file_system_operation.h"
 #include "webkit/fileapi/native_file_util.h"
+#include "webkit/fileapi/transient_file_util.h"
 
 namespace fileapi {
 
 IsolatedMountPointProvider::IsolatedMountPointProvider()
     : isolated_file_util_(new AsyncFileUtilAdapter(new IsolatedFileUtil())),
-      dragged_file_util_(new AsyncFileUtilAdapter(new DraggedFileUtil())) {
+      dragged_file_util_(new AsyncFileUtilAdapter(new DraggedFileUtil())),
+      transient_file_util_(new AsyncFileUtilAdapter(new TransientFileUtil())) {
 }
 
 IsolatedMountPointProvider::~IsolatedMountPointProvider() {
 }
 
 bool IsolatedMountPointProvider::CanHandleType(FileSystemType type) const {
   switch (type) {
     case kFileSystemTypeIsolated:
     case kFileSystemTypeDragged:
+    case kFileSystemTypeForTransientFile:
       return true;
 #if !defined(OS_CHROMEOS)
     case kFileSystemTypeNativeLocal:
     case kFileSystemTypeNativeForPlatformApp:
       return true;
 #endif
     default:
       return false;
   }
 }
@@ skipping 17 matching lines @@
   return base::FilePath();
 }
 
 FileSystemFileUtil* IsolatedMountPointProvider::GetFileUtil(
     FileSystemType type) {
   switch (type) {
     case kFileSystemTypeNativeLocal:
       return isolated_file_util_->sync_file_util();
     case kFileSystemTypeDragged:
       return dragged_file_util_->sync_file_util();
+    case kFileSystemTypeForTransientFile:
+      return transient_file_util_->sync_file_util();
     default:
       NOTREACHED();
   }
   return NULL;
 }
 
 AsyncFileUtil* IsolatedMountPointProvider::GetAsyncFileUtil(
     FileSystemType type) {
   switch (type) {
     case kFileSystemTypeNativeLocal:
       return isolated_file_util_.get();
     case kFileSystemTypeDragged:
       return dragged_file_util_.get();
+    case kFileSystemTypeForTransientFile:
+      return transient_file_util_.get();
     default:
       NOTREACHED();
   }
   return NULL;
 }
 
 CopyOrMoveFileValidatorFactory*
 IsolatedMountPointProvider::GetCopyOrMoveFileValidatorFactory(
     FileSystemType type, base::PlatformFileError* error_code) {
   DCHECK(error_code);
@@ skipping 55 matching lines @@
 void IsolatedMountPointProvider::DeleteFileSystem(
     const GURL& origin_url,
     FileSystemType type,
     FileSystemContext* context,
     const DeleteFileSystemCallback& callback) {
   NOTREACHED();
   callback.Run(base::PLATFORM_FILE_ERROR_INVALID_OPERATION);
 }
 
 }  // namespace fileapi