Add Chromium environment application test support.

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
new file mode 100644
index 0000000000000000000000000000000000000000..05086204101ef58856403f4fad0020b7398ee274
--- /dev/null
+++ b/mojo/environment/default_run_loop_impl.cc
@@ -0,0 +1,28 @@
+// 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"
+

[viettrungluu, 2014/10/31 20:26:46]

nit: #include "base/logging.h"

[msw, 2014/10/31 20:39:54]

Done.

+#include "base/compiler_specific.h"

[viettrungluu, 2014/10/31 20:26:46]

Not needed (see below).

[msw, 2014/10/31 20:39:54]

Done.

+#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();
+  ALLOW_UNUSED_LOCAL(message_loop);

[viettrungluu, 2014/10/31 20:26:45]

Not needed: not only is CHECK_EQ() always expanded, but even DCHECK_EQ() is
always expanded to something (i.e., always "uses" its arguments, even for
Release builds with DCHECKs disabled).

[msw, 2014/10/31 20:39:54]

Done. I suspected that might be the case, but wasn't sure; thanks!

+  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