Add support for dispatch contexts on BindingSet

mojo/public/cpp/bindings/lib/binding_state.cc

 // 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.
 
 #include "mojo/public/cpp/bindings/lib/binding_state.h"
 
 namespace mojo {
 namespace internal {
 
 SimpleBindingState::SimpleBindingState() = default;
@@ skipping 61 matching lines @@
   if (!connection_error_handler_.is_null())
     connection_error_handler_.Run();
 }
 
 // -----------------------------------------------------------------------------
 
 MultiplexedBindingState::MultiplexedBindingState() = default;
 
 MultiplexedBindingState::~MultiplexedBindingState() = default;
 
+void MultiplexedBindingState::AddFilter(
+    std::unique_ptr<MessageReceiver> filter) {
+  DCHECK(endpoint_client_);
+  endpoint_client_->AddFilter(std::move(filter));
+}
+
 bool MultiplexedBindingState::HasAssociatedInterfaces() const {
   return router_ ? router_->HasAssociatedEndpoints() : false;
 }
 
 void MultiplexedBindingState::PauseIncomingMethodCallProcessing() {
   DCHECK(router_);
   router_->PauseIncomingMethodCallProcessing();
 }
 void MultiplexedBindingState::ResumeIncomingMethodCallProcessing() {
   DCHECK(router_);
@@ skipping 41 matching lines @@
                  base::Unretained(this)));
 }
 
 void MultiplexedBindingState::RunConnectionErrorHandler() {
   if (!connection_error_handler_.is_null())
     connection_error_handler_.Run();
 }
 
 }  // namesapce internal
 }  // namespace mojo