Make sure media query results are re-collected.

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.
@@ skipping 220 matching lines @@
 }
 
 void StyleEngine::modifiedStyleSheetCandidateNode(Node& node) {
   if (!node.isConnected())
     return;
 
   markTreeScopeDirty(node.treeScope());
   resolverChanged(AnalyzedStyleUpdate);
 }
 
+void StyleEngine::mediaQueriesChangedInScope(TreeScope& treeScope) {
+  if (ScopedStyleResolver* resolver = treeScope.scopedStyleResolver())
+    resolver->setNeedsAppendAllSheets();
+  setNeedsActiveStyleUpdate(treeScope);
+}
+
 void StyleEngine::watchedSelectorsChanged() {
   m_globalRuleSet.initWatchedSelectorsRuleSet(document());
   // TODO(rune@opera.com): Should be able to use RuleSetInvalidation here.
   document().setNeedsStyleRecalc(SubtreeStyleChange,
                                  StyleChangeReasonForTracing::create(
                                      StyleChangeReason::DeclarativeContent));
 }
 
 bool StyleEngine::shouldUpdateDocumentStyleSheetCollection() const {
   return m_allTreeScopesDirty || m_documentScopeDirty;
@@ skipping 981 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink