Port sky_shell to Linux for testing

sky/shell/service_provider.cc

Index: sky/shell/service_provider.cc
diff --git a/sky/shell/service_provider.cc b/sky/shell/service_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3b2b9ad1870c187dfce7e29d571a1229e25249da
--- /dev/null
+++ b/sky/shell/service_provider.cc
@@ -0,0 +1,20 @@
+// Copyright 2015 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 "sky/shell/service_provider.h"
+
+#include "base/single_thread_task_runner.h"
+
+namespace sky {
+namespace shell {
+
+ServiceProviderContext::ServiceProviderContext(
+    scoped_refptr<base::SingleThreadTaskRunner> runner)
+      : platform_task_runner(runner.Pass()) {}
+
+ServiceProviderContext::~ServiceProviderContext() {
+}
+
+}  // namespace shell
+}  // namespace sky