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

mojo/apps/js/test/js_to_cpp_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 "base/at_exit.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 376 matching lines @@
   JsToCppTest() {}
 
   void RunTest(const std::string& test, CppSideConnection* cpp_side) {
     cpp_side->set_run_loop(&run_loop_);
 
     MessagePipe pipe;
     js_to_cpp::JsSidePtr js_side =
         MakeProxy<js_to_cpp::JsSide>(pipe.handle0.Pass());
     js_side.set_client(cpp_side);
 
-    js_side.internal_state()->router()->EnableTestingMode();
+    js_side.internal_state()->router_for_testing()->EnableTestingMode();
 
     cpp_side->set_js_side(js_side.get());
 
     gin::IsolateHolder instance(gin::IsolateHolder::kStrictMode);
     apps::MojoRunnerDelegate delegate;
     gin::ShellRunner runner(&delegate, instance.isolate());
     delegate.Start(&runner, pipe.handle1.release().value(), test);
 
     run_loop_.Run();
   }
@@ skipping 37 matching lines @@
   if (IsRunningOnIsolatedBot())
     return;
 
   BackPointerCppSideConnection cpp_side_connection;
   RunTest("mojo/apps/js/test/js_to_cpp_unittest", &cpp_side_connection);
   EXPECT_TRUE(cpp_side_connection.DidSucceed());
 }
 
 }  // namespace js
 }  // namespace mojo