Mojo C++ Bindings: Support custom impl ref types

mojo/public/cpp/bindings/tests/sample_service_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 <stddef.h>
 #include <stdint.h>
 #include <algorithm>
 #include <ostream>
 #include <string>
 #include <utility>
@@ skipping 292 matching lines @@
 
     if (g_dump_message_as_hex) {
       DumpHex(reinterpret_cast<const uint8_t*>(message->data()),
               message->data_num_bytes());
     }
 
     // In the receiving process, an implementation of ServiceStub is known to
     // the system. It receives the incoming message.
     ServiceImpl impl;
 
-    ServiceStub stub;
+    ServiceStub<> stub;
     stub.set_sink(&impl);
     return stub.Accept(message);
   }
 
   bool AcceptWithResponder(mojo::Message* message,
                            mojo::MessageReceiver* responder) override {
     return false;
   }
 };
 
@@ skipping 48 matching lines @@
   ASSERT_FALSE(defaults->a22.is_null());
   EXPECT_EQ(imported::Shape::RECTANGLE, defaults->a22->shape);
   EXPECT_EQ(imported::Color::BLACK, defaults->a22->color);
   EXPECT_EQ(0xFFFFFFFFFFFFFFFFULL, defaults->a23);
   EXPECT_EQ(0x123456789, defaults->a24);
   EXPECT_EQ(-0x123456789, defaults->a25);
 }
 
 }  // namespace
 }  // namespace sample