Backend for css rule tracking

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 19 matching lines @@
 #include "core/dom/StyleEngine.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSDefaultStyleSheets.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/FontFaceCache.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/invalidation/InvalidationSet.h"
 #include "core/css/resolver/ScopedStyleResolver.h"
+#include "core/css/resolver/StyleRuleUsageTracker.h"
 #include "core/css/resolver/ViewportStyleResolver.h"
 #include "core/dom/DocumentStyleSheetCollector.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/ShadowTreeStyleSheetCollection.h"
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLIFrameElement.h"
@@ skipping 375 matching lines @@
       documentStyleSheetCollection().activeAuthorStyleSheets());
   for (TreeScope* treeScope : m_activeTreeScopes) {
     if (TreeScopeStyleSheetCollection* collection =
             m_styleSheetCollectionMap.get(treeScope))
       m_resolver->appendAuthorStyleSheets(
           collection->activeAuthorStyleSheets());
   }
   m_resolver->finishAppendAuthorStyleSheets();
 }
 
+void StyleEngine::setRuleUsageTracker(StyleRuleUsageTracker* tracker) {
+  m_tracker = tracker;
+
+  if (m_tracker && m_resolver)
+    m_resolver->setRuleUsageTracker(m_tracker);

[pfeldman, 2016/10/31 21:03:35]

m_resolver->setRuleUsageTracker(true);

[caseq, 2016/10/31 21:06:46]

I think what you mean here is
if (m_resolver)
  m_resolver->setRuleUsageTracker(m_tracker)

+}
+
 void StyleEngine::createResolver() {
   m_resolver = StyleResolver::create(*m_document);
 
+  m_resolver->setRuleUsageTracker(m_tracker);

[pfeldman, 2016/10/31 21:03:35]

if (m_tracker)
  m_resolved->setRuleUsageTracker(true);


but where is m_resolved->setRuleUsageTracker(false) ?

[caseq, 2016/10/31 21:06:46]

This is fine, we're just creating the new resolver here.

+
   // A scoped style resolver for document will be created during
   // appendActiveAuthorStyleSheets if needed.
   appendActiveAuthorStyleSheets();
 }
 
 void StyleEngine::clearResolver() {
   DCHECK(!document().inStyleRecalc());
   DCHECK(isMaster() || !m_resolver);
 
   document().clearScopedStyleResolver();
@@ skipping 559 matching lines @@
   visitor->trace(m_styleSheetCollectionMap);
   visitor->trace(m_resolver);
   visitor->trace(m_viewportResolver);
   visitor->trace(m_styleInvalidator);
   visitor->trace(m_dirtyTreeScopes);
   visitor->trace(m_activeTreeScopes);
   visitor->trace(m_treeBoundaryCrossingScopes);
   visitor->trace(m_fontSelector);
   visitor->trace(m_textToSheetCache);
   visitor->trace(m_sheetToTextCache);
+  visitor->trace(m_tracker);
   CSSFontSelectorClient::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink