Add a CHECK for null stuff in CompactPendingRules

third_party/WebKit/Source/core/css/RuleSet.cpp

Index: third_party/WebKit/Source/core/css/RuleSet.cpp
diff --git a/third_party/WebKit/Source/core/css/RuleSet.cpp b/third_party/WebKit/Source/core/css/RuleSet.cpp
index 8885cbdbd354535664a9b14cd8f2ca7a7b2038ef..e2505aec302b160d8de5397d75f1c9ac21be7a39 100644
--- a/third_party/WebKit/Source/core/css/RuleSet.cpp
+++ b/third_party/WebKit/Source/core/css/RuleSet.cpp
@@ -350,8 +350,13 @@ 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());
@@ -365,7 +370,8 @@ void RuleSet::compactPendingRules(PendingRuleMap& pendingMap,
 }
 
 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);