Remove most of the old compositing code.

sky/engine/core/rendering/compositing/CompositingLayerAssigner.h

Index: sky/engine/core/rendering/compositing/CompositingLayerAssigner.h
diff --git a/sky/engine/core/rendering/compositing/CompositingLayerAssigner.h b/sky/engine/core/rendering/compositing/CompositingLayerAssigner.h
deleted file mode 100644
index 8d2f62f259cca7960318b7815132603436fc6856..0000000000000000000000000000000000000000
--- a/sky/engine/core/rendering/compositing/CompositingLayerAssigner.h
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2014 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGLAYERASSIGNER_H_
-#define SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGLAYERASSIGNER_H_
-
-#include "sky/engine/core/rendering/compositing/RenderLayerCompositor.h"
-#include "sky/engine/platform/geometry/IntRect.h"
-#include "sky/engine/platform/geometry/LayoutPoint.h"
-
-namespace blink {
-
-class RenderLayer;
-
-class CompositingLayerAssigner {
-public:
-    explicit CompositingLayerAssigner(RenderLayerCompositor*);
-    ~CompositingLayerAssigner();
-
-    void assign(RenderLayer* updateRoot, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
-
-    bool layersChanged() const { return m_layersChanged; }
-
-    // FIXME: This function should be private. We should remove the one caller
-    // once we've fixed the compositing chicken/egg issues.
-    CompositingStateTransitionType computeCompositedLayerUpdate(RenderLayer*);
-
-private:
-    struct SquashingState {
-        SquashingState()
-            : mostRecentMapping(0)
-            , hasMostRecentMapping(false)
-            , haveAssignedBackingsToEntireSquashingLayerSubtree(false)
-            , nextSquashedLayerIndex(0)
-            , totalAreaOfSquashedRects(0) { }
-
-        void updateSquashingStateForNewMapping(CompositedLayerMapping*, bool hasNewCompositedLayerMapping);
-
-        // The most recent composited backing that the layer should squash onto if needed.
-        CompositedLayerMapping* mostRecentMapping;
-        bool hasMostRecentMapping;
-
-        // Whether all RenderLayers in the stacking subtree rooted at the most recent mapping's
-        // owning layer have had CompositedLayerMappings assigned. Layers cannot squash into a
-        // CompositedLayerMapping owned by a stacking ancestor, since this changes paint order.
-        bool haveAssignedBackingsToEntireSquashingLayerSubtree;
-
-        // Counter that tracks what index the next RenderLayer would be if it gets squashed to the current squashing layer.
-        size_t nextSquashedLayerIndex;
-
-        // The absolute bounding rect of all the squashed layers.
-        IntRect boundingRect;
-
-        // This is simply the sum of the areas of the squashed rects. This can be very skewed if the rects overlap,
-        // but should be close enough to drive a heuristic.
-        uint64_t totalAreaOfSquashedRects;
-    };
-
-    void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
-    CompositingReasons getReasonsPreventingSquashing(const RenderLayer*, const SquashingState&);
-    void updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
-    bool needsOwnBacking(const RenderLayer*) const;
-
-    RenderLayerCompositor* m_compositor;
-    bool m_layerSquashingEnabled;
-    bool m_layersChanged;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGLAYERASSIGNER_H_