[cc] Add window decoration layers (NinePatch)

cc/CCDecorationLayerImpl.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 CCDecorationLayerImpl_h
+#define CCDecorationLayerImpl_h
+
+#include "CCLayerImpl.h"
+#include <public/WebTransformationMatrix.h>
+
+namespace cc {
+
+class CCDecorationLayerImpl : public CCLayerImpl {
+public:
+    static scoped_ptr<CCDecorationLayerImpl> create(int id)
+    {
+        return make_scoped_ptr(new CCDecorationLayerImpl(id));
+    }
+    virtual ~CCDecorationLayerImpl();
+
+    virtual void willDraw(CCResourceProvider*) OVERRIDE;
+    virtual void appendQuads(CCQuadSink&, CCAppendQuadsData&) OVERRIDE;
+    virtual void didDraw(CCResourceProvider*) OVERRIDE;
+    virtual CCResourceProvider::ResourceId contentsResourceId() const OVERRIDE;
+    virtual void dumpLayerProperties(std::string*, int indent) const OVERRIDE;
+    virtual void didLoseContext() OVERRIDE;
+    void setResourceId(unsigned id) { m_resourceId = id; }
+    void setDecorationLayout(const IntSize& imageBounds, const IntRect& aperture);
+
+protected:
+    explicit CCDecorationLayerImpl(int id);
+
+private:
+
+    virtual const char* layerTypeAsString() const OVERRIDE { return "DecorationLayer"; }
+
+    // The size of the decoration bitmap in pixels.
+    IntSize m_imageBounds;
+
+    // The transparent center region that shows the parent layer's contents in image space.
+    IntRect m_imageAperture;
+
+    CCResourceProvider::ResourceId m_resourceId;
+};
+
+}
+
+#endif // CCDecorationLayerImpl_h