Support style invalidation for ::content.

Source/core/css/invalidation/StyleInvalidator.cpp

Index: Source/core/css/invalidation/StyleInvalidator.cpp
diff --git a/Source/core/css/invalidation/StyleInvalidator.cpp b/Source/core/css/invalidation/StyleInvalidator.cpp
index 8d506a5a375a70a155f346b035b20d8b69c84dbb..c5c4f5f637931a10c6475ad8dc70b6b5ec5e1003 100644
--- a/Source/core/css/invalidation/StyleInvalidator.cpp
+++ b/Source/core/css/invalidation/StyleInvalidator.cpp
@@ -83,6 +83,8 @@ void StyleInvalidator::RecursionData::pushInvalidationSet(const DescendantInvali
     ASSERT(!m_wholeSubtreeInvalid);
     if (invalidationSet.treeBoundaryCrossing())
         m_treeBoundaryCrossing = true;
+    if (invalidationSet.insertionPointCrossing())
+        m_insertionPointCrossing = true;
     if (invalidationSet.wholeSubtreeInvalid()) {
         m_wholeSubtreeInvalid = true;
         return;
@@ -100,6 +102,9 @@ ALWAYS_INLINE bool StyleInvalidator::RecursionData::matchesCurrentInvalidationSe
         return true;
     }
 
+    if (m_insertionPointCrossing && element.isInsertionPoint())
+        return true;
+
     for (const auto& invalidationSet : m_invalidationSets) {
         if (invalidationSet->invalidatesElement(element))
             return true;
@@ -173,6 +178,12 @@ bool StyleInvalidator::invalidate(Element& element, StyleInvalidator::RecursionD
         }
     }
 
+    if (recursionData.insertionPointCrossing() && element.isInsertionPoint()) {
+        const InsertionPoint& insertionPoint = toInsertionPoint(element);
+        for (size_t i = 0; i < insertionPoint.size(); ++i)

[esprehn, 2014/10/16 02:19:06]

Just set SubtreeStyleChange on the InsertionPoint itself.

[rune, 2014/10/16 12:18:36]

Done.

+            insertionPoint.at(i)->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
+    }
+
     element.clearChildNeedsStyleInvalidation();
     element.clearNeedsStyleInvalidation();