Add Chromium environment application test support.

mojo/environment/environment.cc

Index: mojo/environment/environment.cc
diff --git a/mojo/environment/environment.cc b/mojo/environment/environment.cc
index 72b5c081411545ce17bb1485bf2841222132c46c..418d89e60e6cd453826ac31d814ef0946f3a7348 100644
--- a/mojo/environment/environment.cc
+++ b/mojo/environment/environment.cc
@@ -4,9 +4,9 @@
 
 #include "mojo/public/cpp/environment/environment.h"
 
-#include "base/logging.h"
 #include "mojo/environment/default_async_waiter_impl.h"
 #include "mojo/environment/default_logger_impl.h"
+#include "mojo/environment/default_run_loop_impl.h"
 
 namespace mojo {
 
@@ -36,14 +36,12 @@ const MojoLogger* Environment::GetDefaultLogger() {
 
 // static
 void Environment::InstantiateDefaultRunLoop() {
-  // TODO(msw): Support the base::MessageLoop/RunLoop Chromium-environment.
-  NOTIMPLEMENTED();
+  internal::InstantiateDefaultRunLoopImpl();
 }
 
 // static
 void Environment::DestroyDefaultRunLoop() {
-  // TODO(msw): Support the base::MessageLoop/RunLoop Chromium-environment.
-  NOTIMPLEMENTED();
+  internal::DestroyDefaultRunLoopImpl();
 }
 
 }  // namespace mojo