Disallow setting invalid values for registered properties via CSSOM

third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 100 matching lines @@
   StyleSheetContents* styleSheetContents =
       StyleSheetContents::create(strictCSSParserContext());
   String text = " div { " + shorthand + ": " + oldText + "; }";
   CSSParser::parseSheet(CSSParserContext(*document, nullptr),
                         styleSheetContents, text);
 
   CSSStyleSheet* styleSheet = CSSStyleSheet::create(styleSheetContents);
   CSSStyleRule* rule = toCSSStyleRule(styleSheet->item(0));
   CSSStyleDeclaration* style = rule->style();
   DummyExceptionStateForTesting exceptionState;
-  style->setProperty(longhand, newValue, style->getPropertyPriority(longhand),
-                     exceptionState);
+  style->setProperty(nullptr, longhand, newValue,
+                     style->getPropertyPriority(longhand), exceptionState);
   return style->getPropertyValue(shorthand);
 }
 
 HeapVector<Member<CSSStyleRule>> filterDuplicateRules(CSSRuleList* ruleList) {
   HeapVector<Member<CSSStyleRule>> uniqRules;
   HeapHashSet<Member<CSSRule>> uniqRulesSet;
   for (unsigned i = ruleList ? ruleList->length() : 0; i > 0; --i) {
     CSSRule* rule = ruleList->item(i - 1);
     if (!rule || rule->type() != CSSRule::kStyleRule ||
         uniqRulesSet.contains(rule))
@@ skipping 2382 matching lines @@
   visitor->trace(m_cssStyleSheetToInspectorStyleSheet);
   visitor->trace(m_documentToCSSStyleSheets);
   visitor->trace(m_invalidatedDocuments);
   visitor->trace(m_nodeToInspectorStyleSheet);
   visitor->trace(m_inspectorUserAgentStyleSheet);
   visitor->trace(m_tracker);
   InspectorBaseAgent::trace(visitor);
 }
 
 }  // namespace blink