Support custom message filtering on Mojo binding objects

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

 // Copyright 2013 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"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
 
@@ skipping 96 matching lines @@
 }
 
 void Message::CloseHandles() {
   for (std::vector<Handle>::iterator it = handles_.begin();
        it != handles_.end(); ++it) {
     if (it->is_valid())
       CloseRaw(*it);
   }
 }
 
+PassThroughFilter::PassThroughFilter() {}
+
+PassThroughFilter::~PassThroughFilter() {}
+
+bool PassThroughFilter::Accept(Message* message) { return true; }
+
 SyncMessageResponseContext::SyncMessageResponseContext()
     : outer_context_(current()) {
   g_tls_sync_response_context.Get().Set(this);
 }
 
 SyncMessageResponseContext::~SyncMessageResponseContext() {
   DCHECK_EQ(current(), this);
   g_tls_sync_response_context.Get().Set(outer_context_);
 }
 
@@ skipping 89 matching lines @@
 // static
 void SyncMessageResponseSetup::SetCurrentSyncResponseMessage(Message* message) {
   SyncMessageResponseContext* context = SyncMessageResponseContext::current();
   if (context)
     context->response_ = std::move(*message);
 }
 
 }  // namespace internal
 
 }  // namespace mojo