Add support for element ids in TargetedStyleRecalc

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 cd53db244ef75f468a674bab7496a822d8228e87..8b659bbcba7c80e024016c374eb445b5eeafbe97 100644
--- a/Source/core/css/invalidation/StyleInvalidator.cpp
+++ b/Source/core/css/invalidation/StyleInvalidator.cpp
@@ -59,6 +59,7 @@ void StyleInvalidator::RecursionData::pushInvalidationSet(const DescendantInvali
 {
     invalidationSet.getClasses(m_invalidationClasses);
     invalidationSet.getAttributes(m_invalidationAttributes);
+    invalidationSet.getIds(m_invalidationIds);
     m_foundInvalidationSet = true;
 }
 
@@ -77,7 +78,13 @@ bool StyleInvalidator::RecursionData::matchesCurrentInvalidationSets(Element& el
                 return true;
         }
     }
-
+    if (element.hasID()) {
+        const AtomicString& id = element.idForStyleResolution();
+        for (Vector<AtomicString>::const_iterator it = m_invalidationIds.begin(); it != m_invalidationIds.end(); ++it) {
+            if (id == *it)

[esprehn, 2014/04/01 23:11:19]

You don't need this loop,

if (m_invalidationIds.contains(element.idForStyleResolution()))
  return true;

[chrishtr, 2014/04/01 23:20:08]

Good point! Fixed.

+                return true;
+        }
+    }
     return false;
 }