[cc] Add window decoration layers (NinePatch)

cc/DecorationLayerChromium.h

+// Copyright 2012 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 DecorationLayerChromium_h
+#define DecorationLayerChromium_h
+
+#include "LayerChromium.h"
+#include "LayerTextureUpdater.h"
+#include "SkBitmap.h"
+
+namespace cc {
+
+class DecorationLayerTextureUpdater;
+
+// A Layer that contains sparse quads being sourced from bitmaps.
+class DecorationLayerChromium : public LayerChromium {
+public:
+    static scoped_refptr<DecorationLayerChromium> create();
+    virtual ~DecorationLayerChromium();
+
+    virtual bool drawsContent() const OVERRIDE;
+    virtual void setTexturePriorities(const CCPriorityCalculator&) OVERRIDE;
+    virtual void update(CCTextureUpdateQueue&, const CCOcclusionTracker*, CCRenderingStats&) OVERRIDE;
+    virtual bool needsContentsScale() const OVERRIDE;
+    virtual void pushPropertiesTo(CCLayerImpl*) OVERRIDE;
+
+    void setBitmap(const SkBitmap& bitmap, const IntRect& aperture);
+
+private:
+    DecorationLayerChromium();
+    scoped_ptr<CCLayerImpl> createCCLayerImpl() OVERRIDE;
+
+    virtual void createTextureUpdaterIfNeeded() OVERRIDE;
+
+    RefPtr<DecorationLayerTextureUpdater> m_textureUpdater;
+    OwnPtr<LayerTextureUpdater::Texture> m_texture;
+
+    SkBitmap m_bitmap;
+    bool m_bitmapDirty;
+
+    // The transparent center region that shows the parent layer's contents in image space.
+    IntRect m_imageAperture;
+};
+
+}
+
+#endif