Add Mojo application test support to Chromium.

mojo/environment/default_run_loop_impl.cc

Index: mojo/environment/default_run_loop_impl.cc
diff --git a/mojo/environment/default_run_loop_impl.cc b/mojo/environment/default_run_loop_impl.cc
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index 0000000000000000000000000000000000000000..07037b73430f1ce8619df0b2f4592166f488c411
--- /dev/null
+++ b/mojo/environment/default_run_loop_impl.cc
@@ -0,0 +1,23 @@
+// 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() {
+  // Not leaked: accessible from |base::MessageLoop::current()|.
+  new base::MessageLoop();
+}
+
+void DestroyDefaultRunLoopImpl() {
+  delete base::MessageLoop::current();
+}
+
+}  // namespace internal
+}  // namespace mojo