Implement style invalidation tree walk for targeted style recalc upon class change.

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 3757bdbb483f401f43f900089622b6a4584ce8b2..4e29e5e282da5c60222cece23af4b72cc0946aef 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -638,6 +638,21 @@ void Node::setIsLink(bool isLink)
     setFlag(isLink && !SVGImage::isInSVGImage(toElement(this)), IsLinkFlag);
 }
 
+void Node::setNeedsStyleInvalidation()
+{
+    setFlag(NeedsStyleInvalidation);
+    markAncestorsWithChildNeedsStyleInvalidation();
+}
+

[ojan, 2014/01/30 19:08:39]

extra line break

[chrishtr, 2014/01/30 19:25:48]

Done.

+
+void Node::markAncestorsWithChildNeedsStyleInvalidation()
+{
+    for (Node* node = this; node && !node->childNeedsStyleInvalidation(); node = node->parentOrShadowHostNode())
+        node->setChildNeedsStyleInvalidation();
+    if (document().childNeedsStyleInvalidation())
+        document().scheduleStyleRecalc();
+}
+
 void Node::markAncestorsWithChildNeedsDistributionRecalc()
 {
     for (Node* node = this; node && !node->childNeedsDistributionRecalc(); node = node->parentOrShadowHostNode())