Add a CHECK for null stuff in CompactPendingRules

third_party/WebKit/Source/core/css/RuleSet.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 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/)
@@ skipping 332 matching lines @@
   for (size_t selectorIndex = 0; selectorIndex != kNotFound;
        selectorIndex =
            rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
     addRule(rule, selectorIndex, addRuleFlags);
 }
 
 void RuleSet::compactPendingRules(PendingRuleMap& pendingMap,
                                   CompactRuleMap& compactMap) {
   for (auto& item : pendingMap) {
     HeapLinkedStack<RuleData>* pendingRules = item.value.release();
+    // TODO(meade): crbug.com/694520
+    CHECK(!item.key.isNull());
+    CHECK(pendingRules);
     CompactRuleMap::ValueType* compactRules =
         compactMap.insert(item.key, nullptr).storedValue;
+    // TODO(meade): crbug.com/694520
+    CHECK(compactRules);
 
     HeapTerminatedArrayBuilder<RuleData> builder(compactRules->value.release());
     builder.grow(pendingRules->size());
     while (!pendingRules->isEmpty()) {
       builder.append(pendingRules->peek());
       pendingRules->pop();
     }
 
     compactRules->value = builder.release();
   }
 }
 
 void RuleSet::compactRules() {
-  ASSERT(m_pendingRules);
+  // TODO(meade): crbug.com/694520
+  CHECK(m_pendingRules);
   PendingRuleMaps* pendingRules = m_pendingRules.release();
   compactPendingRules(pendingRules->idRules, m_idRules);
   compactPendingRules(pendingRules->classRules, m_classRules);
   compactPendingRules(pendingRules->tagRules, m_tagRules);
   compactPendingRules(pendingRules->shadowPseudoElementRules,
                       m_shadowPseudoElementRules);
   m_linkPseudoClassRules.shrinkToFit();
   m_cuePseudoRules.shrinkToFit();
   m_focusPseudoClassRules.shrinkToFit();
   m_placeholderPseudoRules.shrinkToFit();
@@ skipping 47 matching lines @@
 }
 
 #ifndef NDEBUG
 void RuleSet::show() const {
   for (const auto& rule : m_allRules)
     rule.selector().show();
 }
 #endif
 
 }  // namespace blink