Add support for dispatch contexts on BindingSet

mojo/public/cpp/bindings/lib/binding_state.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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDING_STATE_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDING_STATE_H_
 
 #include <memory>
 #include <utility>
 
@@ skipping 113 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BindingState);
 };
 
 // Base class used for templated binding primitives which may bind a pipe to
 // multiple interfaces.
 class MultiplexedBindingState {
  public:
   MultiplexedBindingState();
   ~MultiplexedBindingState();
 
+  void AddFilter(std::unique_ptr<MessageReceiver> filter);
+
   bool HasAssociatedInterfaces() const;
 
   void PauseIncomingMethodCallProcessing();
   void ResumeIncomingMethodCallProcessing();
 
   bool WaitForIncomingMethodCall(
       MojoDeadline deadline = MOJO_DEADLINE_INDEFINITE);
 
   void Close();
 
@@ skipping 66 matching lines @@
   typename Interface::Stub_ stub_;
   Interface* impl_;
 
   DISALLOW_COPY_AND_ASSIGN(BindingState);
 };
 
 }  // namesapce internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDING_STATE_H_