EDK: Add Core::DuplicateHandleWithReducedRights().

mojo/edk/system/core.h

 // Copyright 2013 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 MOJO_EDK_SYSTEM_CORE_H_
 #define MOJO_EDK_SYSTEM_CORE_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 99 matching lines @@
 
   // This method corresponds to the API function defined in
   // "mojo/public/c/system/time.h":
 
   MojoTimeTicks GetTimeTicksNow();
 
   // This method corresponds to the API function defined in
   // "mojo/public/c/system/handle.h":
   MojoResult Close(MojoHandle handle);
   MojoResult GetRights(MojoHandle handle, UserPointer<MojoHandleRights> rights);
+  MojoResult DuplicateHandleWithReducedRights(
+      MojoHandle handle,
+      MojoHandleRights rights_to_remove,
+      UserPointer<MojoHandle> new_handle);
 
   // These methods correspond to the API functions defined in
   // "mojo/public/c/system/wait.h":
   MojoResult Wait(MojoHandle handle,
                   MojoHandleSignals signals,
                   MojoDeadline deadline,
                   UserPointer<MojoHandleSignalsState> signals_state);
   MojoResult WaitMany(UserPointer<const MojoHandle> handles,
                       UserPointer<const MojoHandleSignals> signals,
                       uint32_t num_handles,
@@ skipping 105 matching lines @@
   util::Mutex mapping_table_mutex_;
   MappingTable mapping_table_ MOJO_GUARDED_BY(mapping_table_mutex_);
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CORE_H_