Add a mojo::RunApplication() for running implementations of ApplicationImplBase.

mojo/public/cpp/application/lib/run_application.cc

+// Copyright 2016 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/application/run_application.h"
+
+#include "mojo/public/cpp/application/application_impl_base.h"
+#include "mojo/public/cpp/system/message_pipe.h"
+#include "mojo/public/cpp/utility/run_loop.h"
+#include "mojo/public/interfaces/application/application.mojom.h"
+
+namespace mojo {
+
+void RunApplication(MojoHandle application_request_handle,
+                    ApplicationImplBase* application_impl) {
+  // TODO(vtl): Possibly we should have an assertion that we're not running, but
+  // that requires TLS.
+
+  RunLoop loop;
+  application_impl->Bind(InterfaceRequest<Application>(
+      MakeScopedHandle(MessagePipeHandle(application_request_handle))));
+  loop.Run();
+
+  // TODO(vtl): Should we unbind stuff here? (Should there be "will start"/"did
+  // stop" notifications to the |ApplicationImplBase|?)
+}
+
+void TerminateApplication() {
+  RunLoop::current()->Quit();
+}
+
+}  // namespace mojo