[SPv2] Respect transform-style in the Blink and cc property trees.

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h

 // Copyright 2015 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 PaintPropertyTreeBuilder_h
 #define PaintPropertyTreeBuilder_h
 
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
@@ skipping 11 matching lines @@
 struct PaintPropertyTreeBuilderContext {
     // State that propagates on the containing block chain (and so is adjusted
     // when an absolute or fixed position object is encountered).
     struct ContainingBlockContext {
         // The combination of a transform and paint offset describes a linear space.
         // When a layout object recur to its children, the main context is expected to refer
         // the object's border box, then the callee will derive its own border box by translating
         // the space with its own layout location.
         TransformPaintPropertyNode* transform = nullptr;
         LayoutPoint paintOffset;
+        // Whether newly created children should flatten their inherited transform
+        // (equivalently, draw into the plane of their parent). Should generally
+        // be updated whenever |transform| is; flattening only needs to happen
+        // to immediate children.
+        bool shouldFlattenInheritedTransform = false;
+        // Rendering context for 3D sorting. See
+        // TransformPaintPropertyNode::renderingContextID.
+        unsigned renderingContextID = 0;
         // The clip node describes the accumulated raster clip for the current subtree.
         // Note that the computed raster region in canvas space for a clip node is independent from
         // the transform and paint offset above. Also the actual raster region may be affected
         // by layerization and occlusion tracking.
         ClipPaintPropertyNode* clip = nullptr;
     };
 
     ContainingBlockContext current;
 
     // Separate context for out-of-flow positioned and fixed positioned elements are needed
@@ skipping 34 matching lines @@
     static void updateOverflowClip(const LayoutObject&, PaintPropertyTreeBuilderContext&);
     static void updatePerspective(const LayoutObject&, PaintPropertyTreeBuilderContext&);
     static void updateSvgLocalToBorderBoxTransform(const LayoutObject&, PaintPropertyTreeBuilderContext&);
     static void updateScrollTranslation(const LayoutObject&, PaintPropertyTreeBuilderContext&);
     static void updateOutOfFlowContext(const LayoutObject&, PaintPropertyTreeBuilderContext&);
 };
 
 } // namespace blink
 
 #endif // PaintPropertyTreeBuilder_h