Basic Sky shell for iOS targets

sky/shell/ios/platform_view_ios.mm

+// 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 "platform_view_ios.h"
+
+namespace sky {
+namespace shell {
+
+void PlatformViewIOS::SurfaceCreated(gfx::AcceleratedWidget widget) {
+  DCHECK(window_ == 0);
+  window_ = widget;
+  SurfaceWasCreated();
+}
+
+void PlatformViewIOS::SurfaceDestroyed() {
+  DCHECK(window_);
+  window_ = 0;
+  SurfaceWasDestroyed();
+}
+
+}  // namespace shell
+}  // namespace sky