Optimize style recalc when adding @keyframes.

third_party/WebKit/Source/core/dom/StyleEngine.h

Index: third_party/WebKit/Source/core/dom/StyleEngine.h
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.h b/third_party/WebKit/Source/core/dom/StyleEngine.h
index b2cd4f001e62058521b5bf47f194b1a75b249b07..2a6f529f1bc6c1e60d1a2aff16d1834e5297463e 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.h
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.h
@@ -123,6 +123,9 @@ public:
     void shadowRootRemovedFromDocument(ShadowRoot*);
     void appendActiveAuthorStyleSheets();
 
+    void setHasUnresolvedKeyframesRule() { m_hasUnresolvedKeyframesRule = true; }
+    void keyframesRulesAdded();
+
     StyleResolver* resolver() const
     {
         return m_resolver.get();
@@ -253,6 +256,7 @@ private:
 
     bool m_ignorePendingStylesheets = false;
     bool m_didCalculateResolver = false;
+    bool m_hasUnresolvedKeyframesRule = false;
 
     Member<StyleResolver> m_resolver;
     StyleInvalidator m_styleInvalidator;