Add thunks for MojoDuplicateHandle[WithReducedRights]().

mojo/public/platform/native/system_impl_private.h

 // Copyright 2015 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.
 
 // Note: This header should be compilable as C.
 
 #ifndef MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_IMPL_PRIVATE_H_
 #define MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_IMPL_PRIVATE_H_
 
 #include "mojo/public/c/system/buffer.h"
@@ skipping 36 matching lines @@
                                         MojoHandle handle,
                                         MojoSystemImpl to_system,
                                         MojoHandle* result_handle);
 
 // APIs mirroring the Mojo system APIs, but also taking a MojoSystemImpl param.
 MojoTimeTicks MojoSystemImplGetTimeTicksNow(MojoSystemImpl system);
 MojoResult MojoSystemImplClose(MojoSystemImpl system, MojoHandle handle);
 MojoResult MojoSystemImplGetRights(MojoSystemImpl system,
                                    MojoHandle handle,
                                    MojoHandleRights* rights);
+MojoResult MojoSystemImplDuplicateHandleWithReducedRights(
+    MojoSystemImpl system,
+    MojoHandle handle,
+    MojoHandleRights rights_to_remove,
+    MojoHandle* new_handle);
+MojoResult MojoSystemImplDuplicateHandle(MojoSystemImpl system,
+                                         MojoHandle handle,
+                                         MojoHandle* new_handle);
 MojoResult MojoSystemImplWait(MojoSystemImpl system,
                               MojoHandle handle,
                               MojoHandleSignals signals,
                               MojoDeadline deadline,
                               struct MojoHandleSignalsState* signals_state);
 MojoResult MojoSystemImplWaitMany(
     MojoSystemImpl system,
     const MojoHandle* handles,
     const MojoHandleSignals* signals,
     uint32_t num_handles,
@@ skipping 89 matching lines @@
                                    uint64_t num_bytes,
                                    void** buffer,
                                    MojoMapBufferFlags flags);
 MojoResult MojoSystemImplUnmapBuffer(MojoSystemImpl system, void* buffer);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus
 
 #endif  // MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_IMPL_PRIVATE_H_