Add Chromium environment application test support.

mojo/environment/default_run_loop_impl.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/environment/default_run_loop_impl.h"
+
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+
+namespace mojo {
+namespace internal {
+
+void InstantiateDefaultRunLoopImpl() {
+  CHECK(!base::MessageLoop::current());
+  // Not leaked: accessible from |base::MessageLoop::current()|.
+  base::MessageLoop* message_loop = new base::MessageLoop();
+  CHECK_EQ(message_loop, base::MessageLoop::current());
+}
+
+void DestroyDefaultRunLoopImpl() {
+  CHECK(base::MessageLoop::current());
+  delete base::MessageLoop::current();
+  CHECK(!base::MessageLoop::current());
+}
+
+}  // namespace internal
+}  // namespace mojo