Validate MessageHeader before using

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

Index: mojo/public/cpp/bindings/lib/message_header_validator.h
diff --git a/mojo/public/cpp/bindings/lib/message_header_validator.h b/mojo/public/cpp/bindings/lib/message_header_validator.h
new file mode 100644
index 0000000000000000000000000000000000000000..d7877fbf7e0ceef8a94fbfb3d550f402d761799c
--- /dev/null
+++ b/mojo/public/cpp/bindings/lib/message_header_validator.h
@@ -0,0 +1,23 @@
+// 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.
+
+#include "mojo/public/cpp/bindings/message.h"
+
+namespace mojo {
+namespace internal {
+
+class MessageHeaderValidator : public MessageReceiver {
+ public:
+  explicit MessageHeaderValidator(MessageReceiver* next);
+
+  virtual bool Accept(Message* message) MOJO_OVERRIDE;
+  virtual bool AcceptWithResponder(Message* message, MessageReceiver* responder)
+      MOJO_OVERRIDE;
+
+ private:
+  MessageReceiver* next_;
+};
+
+}  // namespace internal
+}  // namespace mojo