[SPv2] Adds pre-computed paint property context to PaintLayer.

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

Index: third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
diff --git a/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h b/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
index 6048057f8bf45ca6b03a8d8d4e3967d9cb5f3968..bb112609b6e1317765774b536b4caa0da5d83121 100644
--- a/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
+++ b/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
@@ -5,8 +5,10 @@
 #ifndef ObjectPaintProperties_h
 #define ObjectPaintProperties_h
 
+#include "platform/geometry/LayoutPoint.h"
 #include "platform/graphics/paint/ClipPaintPropertyNode.h"
 #include "platform/graphics/paint/EffectPaintPropertyNode.h"
+#include "platform/graphics/paint/PaintChunkProperties.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
@@ -27,15 +29,18 @@ class ObjectPaintProperties {
     WTF_MAKE_NONCOPYABLE(ObjectPaintProperties);
     USING_FAST_MALLOC(ObjectPaintProperties);
 public:
+    struct PropertyTreeContext;
+
     static PassOwnPtr<ObjectPaintProperties> create(
         PassRefPtr<TransformPaintPropertyNode> paintOffsetTranslation,
         PassRefPtr<TransformPaintPropertyNode> transform,
         PassRefPtr<EffectPaintPropertyNode> effect,
         PassRefPtr<ClipPaintPropertyNode> overflowClip,
         PassRefPtr<TransformPaintPropertyNode> perspective,
-        PassRefPtr<TransformPaintPropertyNode> scrollTranslation)
+        PassRefPtr<TransformPaintPropertyNode> scrollTranslation,
+        PassOwnPtr<PropertyTreeContext> propertyTreeContext)
     {
-        return adoptPtr(new ObjectPaintProperties(paintOffsetTranslation, transform, effect, overflowClip, perspective, scrollTranslation));
+        return adoptPtr(new ObjectPaintProperties(paintOffsetTranslation, transform, effect, overflowClip, perspective, scrollTranslation, propertyTreeContext));
     }
 
     // The hierarchy of transform subtree created by a LayoutObject.
@@ -57,6 +62,19 @@ public:
 
     ClipPaintPropertyNode* overflowClip() const { return m_overflowClip.get(); }
 
+    // This is a complete set of property nodes that should be used as a starting point to paint
+    // this layout object. It is needed becauase some property inherits from the containing block,
+    // not painting parent, thus can't be derived in O(1) during paint walk.
+    // Note: If this layout object has transform or stacking-context effects, those are already
+    // baked into in the context here. However for properties that affects only children,
+    // for example, perspective and overflow clip, those should be applied by the painter
+    // at the right painting step.
+    struct PropertyTreeContext {
+        LayoutPoint paintOffset;
+        PaintChunkProperties properties;
+    };
+    PropertyTreeContext* propertyTreeContext() const { return m_propertyTreeContext.get(); }
+
 private:
     ObjectPaintProperties(
         PassRefPtr<TransformPaintPropertyNode> paintOffsetTranslation,
@@ -64,13 +82,15 @@ private:
         PassRefPtr<EffectPaintPropertyNode> effect,
         PassRefPtr<ClipPaintPropertyNode> overflowClip,
         PassRefPtr<TransformPaintPropertyNode> perspective,
-        PassRefPtr<TransformPaintPropertyNode> scrollTranslation)
+        PassRefPtr<TransformPaintPropertyNode> scrollTranslation,
+        PassOwnPtr<PropertyTreeContext> propertyTreeContext)
         : m_paintOffsetTranslation(paintOffsetTranslation)
         , m_transform(transform)
         , m_effect(effect)
         , m_overflowClip(overflowClip)
         , m_perspective(perspective)
-        , m_scrollTranslation(scrollTranslation) { }
+        , m_scrollTranslation(scrollTranslation)
+        , m_propertyTreeContext(propertyTreeContext) { }
 
     RefPtr<TransformPaintPropertyNode> m_paintOffsetTranslation;
     RefPtr<TransformPaintPropertyNode> m_transform;
@@ -78,6 +98,8 @@ private:
     RefPtr<ClipPaintPropertyNode> m_overflowClip;
     RefPtr<TransformPaintPropertyNode> m_perspective;
     RefPtr<TransformPaintPropertyNode> m_scrollTranslation;
+
+    OwnPtr<PropertyTreeContext> m_propertyTreeContext;
 };
 
 } // namespace blink