Mojo C++ bindings: introduce MultiplexRouter and related classes.

mojo/public/cpp/bindings/tests/validation_unittest.cc

 // 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 <stdio.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 203 matching lines @@
 
   MessageReceiver* test_message_receiver() { return test_message_receiver_; }
 
   ScopedMessagePipeHandle testee_endpoint() { return testee_endpoint_.Pass(); }
 
  private:
   class TestMessageReceiver : public MessageReceiver {
    public:
     TestMessageReceiver(ValidationIntegrationTest* owner,
                         ScopedMessagePipeHandle handle)
-        : owner_(owner), connector_(handle.Pass()) {
+        : owner_(owner),
+          connector_(handle.Pass(),
+                     mojo::internal::Connector::SINGLE_THREADED_SEND) {
       connector_.set_enforce_errors_from_incoming_receiver(false);
     }
     ~TestMessageReceiver() override {}
 
     bool Accept(Message* message) override {
       bool rv = connector_.Accept(message);
       owner_->PumpMessages();
       return rv;
     }
 
@@ skipping 236 matching lines @@
       static_cast<StructWithEnum::EnumWithin>(2)));
   EXPECT_TRUE(StructWithEnum::EnumWithin_IsValidValue(
       static_cast<StructWithEnum::EnumWithin>(3)));
   EXPECT_FALSE(StructWithEnum::EnumWithin_IsValidValue(
       static_cast<StructWithEnum::EnumWithin>(4)));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo