Slimming Paint phase 2 compositing algorithm plumbing

Source/core/layout/LayoutView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 15 matching lines @@
 #include "core/dom/Position.h"
 #include "core/frame/FrameView.h"
 #include "core/layout/HitTestCache.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/LayoutState.h"
 #include "core/layout/PaintInvalidationState.h"
 #include "core/layout/PendingSelection.h"
 #include "platform/PODFreeListArena.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "platform/graphics/paint/DisplayItemTransformTree.h"
 #include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class DeprecatedPaintLayerCompositor;
 class LayoutQuote;
 
 // The root of the layout tree, corresponding to the CSS initial containing block.
@@ skipping 135 matching lines @@
     void pushLayoutState(LayoutState& layoutState) { m_layoutState = &layoutState; }
     void popLayoutState() { ASSERT(m_layoutState); m_layoutState = m_layoutState->next(); }
     void invalidateTreeIfNeeded(PaintInvalidationState&) final;
 
     LayoutRect visualOverflowRect() const override;
 
     // Invalidates paint for the entire view, including composited descendants, but not including child frames.
     // It is very likely you do not want to call this method.
     void setShouldDoFullPaintInvalidationForViewAndAllDescendants();
 
+    void setTransformTree(PassOwnPtr<const DisplayItemTransformTree> transformTree) { m_transformTree = transformTree; }

[chrishtr, 2015/08/14 00:17:19]

Lets move this to WebViewImpl.

+    const DisplayItemTransformTree* transformTree() const { return m_transformTree.get(); }
+
 private:
     void mapLocalToContainer(const LayoutBoxModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = nullptr, const PaintInvalidationState* = nullptr) const override;
 
     template <typename Strategy>
     void commitPendingSelectionAlgorithm();
 
     const LayoutObject* pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&) const override;
     void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override;
     void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
 
@@ skipping 25 matching lines @@
     RefPtr<IntervalArena> m_intervalArena;
 
     LayoutQuote* m_layoutQuoteHead;
     unsigned m_layoutCounterCount;
 
     unsigned m_hitTestCount;
     unsigned m_hitTestCacheHits;
     OwnPtrWillBePersistent<HitTestCache> m_hitTestCache;
 
     OwnPtrWillBePersistent<PendingSelection> m_pendingSelection;
+
+    // TODO(pdr): This is only temporarily here and will be moving
+    // to RenderSurfaceLayerList in a followup patch.
+    OwnPtrWillBePersistent<const DisplayItemTransformTree> m_transformTree;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutView, isLayoutView());
 
 // Suspends the LayoutState cached offset and clipRect optimization. Used under transforms
 // that cannot be represented by LayoutState (common in SVG) and when manipulating the layout
 // tree during layout in ways that can trigger paint invalidation of a non-child (e.g. when a list item
 // moves its list marker around). Note that even when disabled, LayoutState is still used to
 // store layoutDelta.
 class ForceHorriblySlowRectMapping {
@@ skipping 13 matching lines @@
             m_paintInvalidationState->m_cachedOffsetsEnabled = true;
     }
 private:
     const PaintInvalidationState* m_paintInvalidationState;
     bool m_didDisable;
 };
 
 } // namespace blink
 
 #endif // LayoutView_h