Introduce setNeedsActiveStyleUpdate for adding/removing stylesheets.

third_party/WebKit/Source/core/html/HTMLStyleElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
  *           (C) 2007 Rob Buis (buis@kde.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/html/HTMLStyleElement.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/MediaList.h"
 #include "core/dom/Document.h"
+#include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/Event.h"
 #include "core/events/EventSender.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 static StyleEventSender& styleLoadEventSender()
 {
@@ skipping 22 matching lines @@
 {
     return adoptRefWillBeNoop(new HTMLStyleElement(document, createdByParser));
 }
 
 void HTMLStyleElement::parseAttribute(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& value)
 {
     if (name == titleAttr && m_sheet) {
         m_sheet->setTitle(value);
     } else if (name == mediaAttr && inDocument() && document().isActive() && m_sheet) {
         m_sheet->setMediaQueries(MediaQuerySet::create(value));
-        document().modifiedStyleSheet(m_sheet.get());
+        document().styleEngine().setNeedsActiveStyleUpdate(m_sheet.get(), FullStyleUpdate);
     } else {
         HTMLElement::parseAttribute(name, oldValue, value);
     }
 }
 
 void HTMLStyleElement::finishParsingChildren()
 {
     StyleElement::ProcessingResult result = StyleElement::finishParsingChildren(this);
     HTMLElement::finishParsingChildren();
     if (result == StyleElement::ProcessingFatalError)
@@ skipping 71 matching lines @@
         styleSheet->setDisabled(setDisabled);
 }
 
 DEFINE_TRACE(HTMLStyleElement)
 {
     StyleElement::trace(visitor);
     HTMLElement::trace(visitor);
 }
 
 } // namespace blink