Build services as standalone executables

services/service_manager/public/cpp/standalone_service/standalone_service.h

Index: services/service_manager/public/cpp/standalone_service/standalone_service.h
diff --git a/services/service_manager/public/cpp/standalone_service/standalone_service.h b/services/service_manager/public/cpp/standalone_service/standalone_service.h
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index 0000000000000000000000000000000000000000..e7ea3a714846c7ad6c3dce9fb91bb63958c27dbf
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+++ b/services/service_manager/public/cpp/standalone_service/standalone_service.h
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+// 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 "base/callback.h"
+#include "services/service_manager/public/interfaces/service.mojom.h"
+
+namespace service_manager {
+
+using StandaloneServiceCallback = base::Callback<void(mojom::ServiceRequest)>;
+
+// Runs a standalone service in the current process. This takes care of setting
+// up a boilerplate environment, including initializing //base objects, Mojo
+// IPC, running a MessageLoop, and establishing a connection to the Service
+// Manager via canonical command-line arguments.
+//
+// Once a Service request is obtained, |callback| is invoked with it. This call
+// blocks until |callback| returns.
+//
+// NOTE: A typical service should also link against the main() defined in
+// main.cc (next to this header) and thus have no need to call this function
+// directly.
+void RunStandaloneService(const StandaloneServiceCallback& callback);
+
+}  // namespace service_manager