Implement Paint Containment

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 452d1633e847ccc7eaea35cea054db101f70c4d0..4638b7a0573504b10bc4fe44a96fe9797ce3c759 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -701,7 +701,7 @@ public:
 
     bool hasClip() const { return isOutOfFlowPositioned() && !style()->hasAutoClip(); }
     bool hasOverflowClip() const { return m_bitfields.hasOverflowClip(); }
-    bool hasClipOrOverflowClip() const { return hasClip() || hasOverflowClip(); }
+    bool hasOverflowClipPaintContainmentOrClip() const { return hasClip() || hasOverflowClip() || style()->containsPaint(); }

[chrishtr, 2015/12/09 23:34:58]

hasClipRelatedProperty()

 
     bool hasTransformRelatedProperty() const { return m_bitfields.hasTransformRelatedProperty(); }
     bool hasMask() const { return style() && style()->hasMask(); }
@@ -925,7 +925,7 @@ public:
 
     bool canContainFixedPositionObjects() const
     {
-        return isLayoutView() || (hasTransformRelatedProperty() && isLayoutBlock()) || isSVGForeignObject();
+        return isLayoutView() || (hasTransformRelatedProperty() && isLayoutBlock()) || isSVGForeignObject() || style()->containsPaint();
     }
 
     // Convert the given local point to absolute coordinates