Add a simple compositor for Sky

sky/compositor/layer.h

+// Copyright 2014 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.
+
+#ifndef SKY_COMPOSITOR_LAYER_H_
+#define SKY_COMPOSITOR_LAYER_H_
+
+#include "base/memory/ref_counted.h"
+#include "mojo/gpu/gl_texture.h"
+#include "sky/compositor/layer_client.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace sky {
+class LayerHost;
+
+class Layer : public base::RefCounted<Layer> {
+ public:
+  explicit Layer(LayerClient* client);
+
+  void ClearClient();
+
+  void SetSize(const gfx::Size& size);
+  void Display();
+
+  scoped_ptr<mojo::GLTexture> GetTexture();
+
+  const gfx::Size& size() const { return size_; }
+
+  void set_host(LayerHost* host) { host_ = host; }

[eseidel, 2014/11/20 20:40:32]

Huh?  inlined methods are crazy_style?

[abarth-chromium, 2014/11/20 20:47:57]

Trivial getters and setters are crazy_style.

+
+ private:
+  friend class base::RefCounted<Layer>;

[eseidel, 2014/11/20 20:40:31]

You have to add this boilerplate so that RefCounted can delete you?

[abarth-chromium, 2014/11/20 20:47:57]

Yep.  In Blink, we do the opposite (i.e., we make the constructor protected and
have the destruct public).  If you try that, the Clang style checker gets mad at
you and forces you do it this way.

+  ~Layer();
+
+  LayerClient* client_;
+  LayerHost* host_;
+  gfx::Size size_;
+
+  scoped_ptr<mojo::GLTexture> texture_;
+
+  DISALLOW_COPY_AND_ASSIGN(Layer);
+};
+
+}  // namespace sky
+
+#endif  // SKY_COMPOSITOR_LAYER_H_