PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

ppapi/thunk/ppb_file_ref_api.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.
 
 #ifndef PPAPI_THUNK_PPB_FILE_REF_API_H_
 #define PPAPI_THUNK_PPB_FILE_REF_API_H_
 
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
@@ skipping 10 matching lines @@
 namespace thunk {
 
 class PPAPI_THUNK_EXPORT PPB_FileRef_API {
  public:
   virtual ~PPB_FileRef_API() {}
 
   virtual PP_FileSystemType GetFileSystemType() const = 0;
   virtual PP_Var GetName() const = 0;
   virtual PP_Var GetPath() const = 0;
   virtual PP_Resource GetParent() = 0;
-  virtual int32_t MakeDirectory(PP_Bool make_ancestors,
+  virtual int32_t MakeDirectory(PP_Bool exclusive,
+                                PP_Bool make_ancestors,
                                 scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t Touch(PP_Time last_access_time,
                         PP_Time last_modified_time,
                         scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t Delete(scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t Rename(PP_Resource new_file_ref,
                          scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t Query(PP_FileInfo* info,
                         scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t ReadDirectoryEntries(
       const PP_ArrayOutput& output,
       scoped_refptr<TrackedCallback> callback) = 0;
 
   // Internal function for use in proxying. Returns the internal CreateInfo
   // (the contained resource does not carry a ref on behalf of the caller).
   virtual const FileRefCreateInfo& GetCreateInfo() const = 0;
 
   // Private API
   virtual PP_Var GetAbsolutePath() = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_PPB_FILE_REF_API_H_