Notify inspector of stylesheet changes when removing tree scopes.

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 327 matching lines @@
     }
     for (TreeScope* treeScope : treeScopesRemoved)
       m_activeTreeScopes.erase(treeScope);
   }
 
   probe::activeStyleSheetsUpdated(m_document);
 
   m_dirtyTreeScopes.clear();
   m_documentScopeDirty = false;
   m_allTreeScopesDirty = false;
+  m_treeScopesRemoved = false;
 }
 
 void StyleEngine::updateViewport() {
   if (m_viewportResolver)
     m_viewportResolver->updateViewport(documentStyleSheetCollection());
 }
 
 bool StyleEngine::needsActiveStyleUpdate() const {
   return (m_viewportResolver && m_viewportResolver->needsUpdate()) ||
          needsActiveStyleSheetUpdate() || m_globalRuleSet.isDirty();
@@ skipping 26 matching lines @@
   // FIXME: Inspector needs a vector which has all active stylesheets.
   // However, creating such a large vector might cause performance regression.
   // Need to implement some smarter solution.
   return activeStyleSheets;
 }
 
 void StyleEngine::shadowRootRemovedFromDocument(ShadowRoot* shadowRoot) {
   m_styleSheetCollectionMap.erase(shadowRoot);
   m_activeTreeScopes.erase(shadowRoot);
   m_dirtyTreeScopes.erase(shadowRoot);
+  m_treeScopesRemoved = true;
   resetAuthorStyle(*shadowRoot);
 }
 
 void StyleEngine::addTreeBoundaryCrossingScope(const TreeScope& treeScope) {
   m_treeBoundaryCrossingScopes.add(&treeScope.rootNode());
 }
 
 void StyleEngine::resetAuthorStyle(TreeScope& treeScope) {
   m_treeBoundaryCrossingScopes.remove(&treeScope.rootNode());
 
@@ skipping 749 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink