Add a multi-threaded rendering example.

examples/ui/noodles/frame.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 "examples/ui/noodles/frame.h"
+
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPicture.h"
+
+namespace examples {
+
+Frame::Frame(const mojo::Size& size,
+             skia::RefPtr<SkPicture> picture,
+             mojo::gfx::composition::SceneMetadataPtr scene_metadata)
+    : size_(size), picture_(picture), scene_metadata_(scene_metadata.Pass()) {
+  DCHECK(picture_);
+}
+
+Frame::~Frame() {}
+
+void Frame::Paint(SkCanvas* canvas) {
+  DCHECK(canvas);
+
+  canvas->clear(SK_ColorBLACK);
+  canvas->drawPicture(picture_.get());
+  canvas->flush();
+}
+
+}  // namespace examples