Mojo: Implement support for |Foo&| mojom syntax

mojo/public/cpp/bindings/tests/request_response_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 "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/test_support/test_utils.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/bindings/tests/sample_import.mojom.h"
 #include "mojo/public/interfaces/bindings/tests/sample_interfaces.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 32 matching lines @@
 
   virtual void EchoEnum(sample::Enum a,
                         const Callback<void(sample::Enum)>& callback)
       MOJO_OVERRIDE {
     callback.Run(a);
   }
 };
 
 class StringRecorder {
  public:
-  StringRecorder(std::string* buf) : buf_(buf) {
+  explicit StringRecorder(std::string* buf) : buf_(buf) {
   }
   void Run(const String& a) const {
     *buf_ = a;
   }
   void Run(const String& a, const String& b) const {
     *buf_ = a.get() + b.get();
   }
  private:
   std::string* buf_;
 };
 
 class EnumRecorder {
  public:
-  EnumRecorder(sample::Enum* value) : value_(value) {
+  explicit EnumRecorder(sample::Enum* value) : value_(value) {
   }
   void Run(sample::Enum a) const {
     *value_ = a;
   }
  private:
   sample::Enum* value_;
 };
 
 class MessagePipeWriter {
  public:
@@ skipping 70 matching lines @@
   provider->EchoEnum(sample::ENUM_VALUE, EnumRecorder(&value));
 
   PumpMessages();
 
   EXPECT_EQ(sample::ENUM_VALUE, value);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo