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

webkit/fileapi/file_system_util.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/file_system_util.h"
 
 #include "build/build_config.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 223 matching lines @@
     case kFileSystemTypeNativeMedia:
       return "NativeMedia";
     case kFileSystemTypeDeviceMedia:
       return "DeviceMedia";
     case kFileSystemTypeDrive:
       return "Drive";
     case kFileSystemTypeSyncable:
       return "Syncable";
     case kFileSystemTypeNativeForPlatformApp:
       return "NativeForPlatformApp";
+    case kFileSystemTypeForTransientFile:
+      return "TransientFile";
     case kFileSystemInternalTypeEnumStart:
     case kFileSystemInternalTypeEnumEnd:
       NOTREACHED();
       // Fall through.
     case kFileSystemTypeUnknown:
       return "Unknown";
   }
   NOTREACHED();
   return std::string();
 }
@@ skipping 117 matching lines @@
     root.append("/");
   }
   return root;
 }
 
 bool AreSameFileSystem(const FileSystemURL& url1, const FileSystemURL& url2) {
   return url1.origin() == url2.origin() && url1.type() == url2.type();
 }
 
 }  // namespace fileapi