sky/shell should link with sky/engine

sky/shell/ui/platform_impl.cc

+// 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/ui/platform_impl.h"
+
+namespace sky {
+namespace shell {
+
+PlatformImpl::PlatformImpl()
+    : main_thread_task_runner_(base::MessageLoop::current()->task_runner()) {
+}
+
+PlatformImpl::~PlatformImpl() {
+}
+
+blink::WebString PlatformImpl::defaultLocale() {
+  return blink::WebString::fromUTF8("en-US");
+}
+
+base::SingleThreadTaskRunner* PlatformImpl::mainThreadTaskRunner() {
+  return main_thread_task_runner_.get();
+}
+
+}  // namespace shell
+}  // namespace sky