Mojo cpp bindings: add support for validating incoming messages.

mojo/public/cpp/bindings/lib/shared_data.h

 // Copyright 2014 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_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_
 
+#include "mojo/public/cpp/system/macros.h"
+
 namespace mojo {
 namespace internal {
 
 // Used to allocate an instance of T that can be shared via reference counting.
 template <typename T>
 class SharedData {
  public:
   ~SharedData() {
     holder_->Release();
   }
@@ skipping 55 matching lines @@
     MOJO_DISALLOW_COPY_AND_ASSIGN(Holder);
   };
 
   Holder* holder_;
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_SHARED_DATA_H_