Add a simple compositor for Sky

sky/compositor/resource_manager.h

Index: sky/compositor/resource_manager.h
diff --git a/sky/compositor/resource_manager.h b/sky/compositor/resource_manager.h
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+// 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_RESOURCE_MANAGER_H_
+#define SKY_COMPOSITOR_RESOURCE_MANAGER_H_
+
+#include "base/containers/hash_tables.h"
+#include "base/memory/weak_ptr.h"
+#include "mojo/services/public/interfaces/surfaces/surfaces.mojom.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace mojo {
+class GLContext;
+class GLTexture;
+}
+
+namespace sky {
+class Layer;
+class LayerHost;
+
+class ResourceManager {
+ public:
+  explicit ResourceManager(base::WeakPtr<mojo::GLContext> gl_context);
+  ~ResourceManager();
+
+  scoped_ptr<mojo::GLTexture> CreateTexture(const gfx::Size& size);
+
+  mojo::TransferableResourcePtr CreateTransferableResource(Layer* layer);
+  void ReturnResources(mojo::Array<mojo::ReturnedResourcePtr> resources);
+
+ private:
+  base::WeakPtr<mojo::GLContext> gl_context_;
+  uint32_t next_resource_id_;
+  base::hash_map<uint32_t, mojo::GLTexture*> resource_to_texture_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResourceManager);
+};
+
+}  // namespace examples
+
+#endif  // SKY_COMPOSITOR_RESOURCE_MANAGER_H_