Use AnalyzedStyleUpdate for non-blocking sheets.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 212 matching lines @@
 }
 
 void StyleEngine::modifiedStyleSheetCandidateNode(Node* node)
 {
     if (!node->isConnected())
         return;
 
     TreeScope& treeScope = isStyleElement(*node) ? node->treeScope() : *m_document;
     DCHECK(isStyleElement(*node) || treeScope == m_document);
     markTreeScopeDirty(treeScope);
-    resolverChanged(FullStyleUpdate);
+    resolverChanged(AnalyzedStyleUpdate);
 }
 
 void StyleEngine::watchedSelectorsChanged()
 {
     if (m_resolver) {
         m_resolver->initWatchedSelectorRules();
         m_resolver->resetRuleFeatures();
     }
     document().setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::DeclarativeContent));
 }
@@ skipping 585 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(StyleEngine)
 {
     for (auto sheet : m_injectedAuthorStyleSheets) {
         visitor->traceWrappers(sheet);
     }
     visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 } // namespace blink