Make setNeedsActiveStyleUpdate mark treescope dirty only.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/LinkStyle.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/SubresourceIntegrity.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
@@ skipping 369 matching lines @@
           m_owner->relAttribute().getIconType());
     }
   }
 
   if (!m_owner->loadLink(type, as, media, m_owner->referrerPolicy(),
                          builder.url()))
     return;
 
   if (loadStylesheetIfNeeded(builder, type) == NotNeeded && m_sheet) {
     // we no longer contain a stylesheet, e.g. perhaps rel or type was changed
-    StyleSheet* removedSheet = m_sheet.get();
     clearSheet();
-    document().styleEngine().setNeedsActiveStyleUpdate(removedSheet,
-                                                       FullStyleUpdate);
+    document().styleEngine().setNeedsActiveStyleUpdate(m_owner->treeScope());
+    // TODO(rune@opera.com): resolverChanged() can be removed once stylesheet
+    // updates are async. https://crbug.com/567021
+    document().styleEngine().resolverChanged(FullStyleUpdate);
   }
 }
 
 void LinkStyle::setSheetTitle(
     const String& title,
     StyleEngine::ActiveSheetsUpdate updateActiveSheets) {
   if (!m_owner->isInDocumentTree() || !m_owner->relAttribute().isStyleSheet())
     return;
 
   if (m_sheet)
@@ skipping 17 matching lines @@
     removePendingSheet();
 }
 
 DEFINE_TRACE(LinkStyle) {
   visitor->trace(m_sheet);
   LinkResource::trace(visitor);
   ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 }  // namespace blink