Add a use counter for author rules setting display: block on summary.

third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 62 matching lines @@
 #include "core/dom/CSSSelectorWatch.h"
 #include "core/dom/FirstLetterPseudoElement.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/Text.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLSlotElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/layout/GeneratedChildren.h"
 #include "core/layout/LayoutView.h"
 #include "core/style/StyleVariableData.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "core/svg/SVGElement.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/StdLibExtras.h"
@@ skipping 691 matching lines @@
 
         bool needsCollection = false;
         CSSDefaultStyleSheets::instance().ensureDefaultStyleSheetsForElement(*element, needsCollection);
         if (needsCollection)
             collectFeatures();
 
         ElementRuleCollector collector(state.elementContext(), m_selectorFilter, state.style());
 
         matchAllRules(state, collector, matchingBehavior != MatchAllRulesExcludingSMIL);
 
+        // TODO(dominicc): Remove this counter when Issue 590014 is fixed.
+        if (element->hasTagName(HTMLNames::summaryTag)) {
+            MatchedPropertiesRange properties = collector.matchedResult().authorRules();
+            for (auto it = properties.begin(); it != properties.end(); ++it) {
+                CSSValue* value = it->properties->getPropertyCSSValue(CSSPropertyDisplay);
+                if (value && value->isPrimitiveValue() && toCSSPrimitiveValue(*value).getValueID() == CSSValueBlock)
+                    UseCounter::count(element->document(), UseCounter::SummaryElementWithDisplayBlockAuthorRule);
+            }
+        }
+
         if (element->computedStyle() && element->computedStyle()->textAutosizingMultiplier() != state.style()->textAutosizingMultiplier()) {
             // Preserve the text autosizing multiplier on style recalc. Autosizer will update it during layout if needed.
             // NOTE: this must occur before applyMatchedProperties for correct computation of font-relative lengths.
             state.style()->setTextAutosizingMultiplier(element->computedStyle()->textAutosizingMultiplier());
             state.style()->setUnique();
         }
 
         if (state.hasDirAutoAttribute())
             state.style()->setSelfOrAncestorHasDirAutoAttribute(true);
 
@@ skipping 930 matching lines @@
     visitor->trace(m_siblingRuleSet);
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingScopes);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 }
 
 } // namespace blink