InterfacePtr: not configure proxy until actual read/write is needed.

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 388 matching lines @@
   // Test that InterfacePtr<X> applies the correct validators and they don't
   // conflict with each other:
   //   - MessageHeaderValidator
   //   - X::Client::RequestValidator_
   //   - X::ResponseValidator_
 
   IntegrationTestInterface1Client interface1_client;
   IntegrationTestInterface2Ptr interface2_ptr =
       MakeProxy<IntegrationTestInterface2>(testee_endpoint().Pass());
   interface2_ptr.set_client(&interface1_client);
-  interface2_ptr.internal_state()->router()->EnableTestingMode();
+  interface2_ptr.internal_state()->router_for_testing()->EnableTestingMode();
 
   RunValidationTests("integration_", test_message_receiver());
 }
 
 TEST_F(ValidationIntegrationTest, InterfaceImpl) {
   // Test that InterfaceImpl<X> applies the correct validators and they don't
   // conflict with each other:
   //   - MessageHeaderValidator
   //   - X::RequestValidator_
   //   - X::Client::ResponseValidator_
 
   // |interface1_impl| will delete itself when the pipe is closed.
   IntegrationTestInterface1Impl* interface1_impl =
       BindToPipe(new IntegrationTestInterface1Impl(), testee_endpoint().Pass());
   interface1_impl->internal_state()->router()->EnableTestingMode();
 
   RunValidationTests("integration_", test_message_receiver());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo