********** Chromium Blob hacking

content/common/fileapi/file_system_messages.h

 // 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.
 
 // IPC messages for the file system.
 // Multiply-included message file, hence no include guard.
 
 #include "base/files/file_util_proxy.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 98 matching lines @@
 
 // WebFileSystem::readDirectory() message.
 IPC_MESSAGE_CONTROL2(FileSystemHostMsg_ReadDirectory,
                      int /* request_id */,
                      GURL /* path */)
 
 // WebFileWriter::write() message.
 IPC_MESSAGE_CONTROL4(FileSystemHostMsg_Write,
                      int /* request id */,
                      GURL /* file path */,
-                     GURL /* blob URL */,
+                     std::string /* blob UUID */,
                      int64 /* position */)
 
 // WebFileWriter::truncate() message.
 IPC_MESSAGE_CONTROL3(FileSystemHostMsg_Truncate,
                      int /* request id */,
                      GURL /* file path */,
                      int64 /* length */)
 
 // Pepper's Touch() message.
 IPC_MESSAGE_CONTROL4(FileSystemHostMsg_TouchFile,
@@ skipping 39 matching lines @@
                             GURL /* file path */,
                             base::FilePath /* platform_path */)
 
 // Pre- and post-update notifications for ppapi implementation.
 IPC_MESSAGE_CONTROL1(FileSystemHostMsg_WillUpdate,
                      GURL /* file_path */)
 
 IPC_MESSAGE_CONTROL2(FileSystemHostMsg_DidUpdate,
                      GURL /* file_path */,
                      int64 /* delta */)