EDK: Add MojoHandleRights to DispatcherTransport.

mojo/edk/system/handle.h

 // Copyright 2016 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_HANDLE_H_
 #define MOJO_EDK_SYSTEM_HANDLE_H_
 
 #include "mojo/edk/util/ref_ptr.h"
 #include "mojo/public/c/system/handle.h"
 
@@ skipping 15 matching lines @@
   Handle(util::RefPtr<Dispatcher>&& dispatcher, MojoHandleRights rights);
 
   ~Handle();
 
   Handle& operator=(const Handle&);
   Handle& operator=(Handle&&);
 
   // A |Handle| tests as true if it actually has a dispatcher.
   explicit operator bool() const { return !!dispatcher; }
 
+  void reset() { *this = Handle(); }
+
   // Note: |dispatcher| is guaranteed to be null if default-constructed or
   // moved-from, but we make no guarantees about the value of |rights| in either
   // case.
   util::RefPtr<Dispatcher> dispatcher;
   MojoHandleRights rights;
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_HANDLE_H_