PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/proxy/ppapi_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.
 
 // Multiply-included message header, no traditional include guard.
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 1238 matching lines @@
 
 // Creates a FileRef to a path on an internal file system. This message may
 // be sent from the renderer or the plugin.
 IPC_MESSAGE_CONTROL2(PpapiHostMsg_FileRef_CreateInternal,
                      PP_Resource /* file_system */,
                      std::string /* internal_path */)
 
 // Requests that the browser create a directory at the location indicated by
 // the FileRef.
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_FileRef_MakeDirectory,
-                     bool /* make_ancestors */)
+                     int32_t /* make_directory_flags */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_FileRef_MakeDirectoryReply)
 
 // Requests that the browser update the last accessed and last modified times
 // at the location indicated by the FileRef.
 IPC_MESSAGE_CONTROL2(PpapiHostMsg_FileRef_Touch,
                      PP_Time /* last_accessed */,
                      PP_Time /* last_modified */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_FileRef_TouchReply)
 
 // Requests that the browser delete a file or directory at the location
@@ skipping 742 matching lines @@
 IPC_MESSAGE_CONTROL1(PpapiHostMsg_Talk_RequestPermission,
                      PP_TalkPermission /* permission */)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_RequestPermissionReply)
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_Talk_StartRemoting)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_StartRemotingReply)
 IPC_MESSAGE_CONTROL0(PpapiHostMsg_Talk_StopRemoting)
 IPC_MESSAGE_CONTROL0(PpapiPluginMsg_Talk_StopRemotingReply)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_Talk_NotifyEvent, PP_TalkEvent /* event */)
 
 #endif  // !defined(OS_NACL) && !defined(NACL_WIN64)