Re-collect rule features for watched selectors.

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 228 matching lines @@
 {
     if (!node->inDocument())
         return;
 
     TreeScope& treeScope = isStyleElement(*node) ? node->treeScope() : *m_document;
     ASSERT(isStyleElement(*node) || treeScope == m_document);
     markTreeScopeDirty(treeScope);
     resolverChanged(FullStyleUpdate);
 }
 
+void StyleEngine::watchedSelectorsChanged()
+{
+    if (m_resolver) {
+        m_resolver->initWatchedSelectorRules();
+        m_resolver->resetRuleFeatures();
+    }
+    document().setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::DeclarativeContent));
+}
+
 bool StyleEngine::shouldUpdateDocumentStyleSheetCollection(StyleResolverUpdateMode updateMode) const
 {
     return m_documentScopeDirty || updateMode == FullStyleUpdate;
 }
 
 bool StyleEngine::shouldUpdateShadowTreeStyleSheetCollection(StyleResolverUpdateMode updateMode) const
 {
     return !m_dirtyTreeScopes.isEmpty() || updateMode == FullStyleUpdate;
 }
 
@@ skipping 476 matching lines @@
     visitor->trace(m_dirtyTreeScopes);
     visitor->trace(m_activeTreeScopes);
     visitor->trace(m_fontSelector);
     visitor->trace(m_textToSheetCache);
     visitor->trace(m_sheetToTextCache);
 #endif
     CSSFontSelectorClient::trace(visitor);
 }
 
 } // namespace blink