Apply RuleSet changes for active stylesheet changes.

third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp

Index: third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp b/third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp
index e9d24f67be7df7bd283394b81c420509bb6d7a7e..802eb67ae640a0e6343f1e4b116bd823a33d30e5 100644
--- a/third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp
@@ -103,6 +103,22 @@ void ScopedStyleResolver::appendCSSStyleSheet(
       ruleSet.deviceDependentMediaQueryResults());
 }
 
+void ScopedStyleResolver::appendActiveStyleSheets(
+    unsigned index,
+    const ActiveStyleSheetVector& activeSheets) {
+  for (auto activeIterator = activeSheets.begin() + index;
+       activeIterator != activeSheets.end(); activeIterator++) {
+    CSSStyleSheet* sheet = activeIterator->first;
+    if (!activeIterator->second)
+      continue;
+    const RuleSet& ruleSet = *activeIterator->second;
+    m_authorStyleSheets.append(sheet);
+    addKeyframeRules(ruleSet);
+    addFontFaceRules(ruleSet);
+    addTreeBoundaryCrossingRules(ruleSet, sheet, index++);
+  }
+}
+
 void ScopedStyleResolver::collectFeaturesTo(
     RuleFeatureSet& features,
     HeapHashSet<Member<const StyleSheetContents>>&
@@ -155,7 +171,8 @@ void ScopedStyleResolver::addKeyframeStyle(StyleRuleKeyframes* rule) {
   }
 }
 
-static Node& invalidationRootFor(const TreeScope& treeScope) {
+ContainerNode& ScopedStyleResolver::invalidationRootForTreeScope(
+    const TreeScope& treeScope) {
   if (treeScope.rootNode() == treeScope.document())
     return treeScope.document();
   return toShadowRoot(treeScope.rootNode()).host();
@@ -188,7 +205,7 @@ void ScopedStyleResolver::keyframesRulesAdded(const TreeScope& treeScope) {
     // rules were found for the animation-name, we need to recalculate style
     // for the elements in the scope, including its shadow host if
     // applicable.
-    invalidationRootFor(treeScope).setNeedsStyleRecalc(
+    invalidationRootForTreeScope(treeScope).setNeedsStyleRecalc(
         SubtreeStyleChange, StyleChangeReasonForTracing::create(
                                 StyleChangeReason::StyleSheetChange));
     return;