[WIP] Streaming CSS parser

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

Index: third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp b/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp
index b3ba93ffe01df2fb729516d921cd07fbdaf35f58..9fba3151c858fa698d5ca179c6610f0a1a363394 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorStyleSheet.cpp
@@ -238,6 +238,12 @@ void StyleSheetHandler::startRuleBody(unsigned offset) {
 }
 
 void StyleSheetHandler::endRuleBody(unsigned offset) {
+  // Pop off data for a previous invalid rule.
+  if (m_currentRuleData) {
+    m_currentRuleData = nullptr;
+    m_currentRuleDataStack.pop_back();
+  }
+
   ASSERT(!m_currentRuleDataStack.isEmpty());
   m_currentRuleDataStack.back()->ruleBodyRange.end = offset;
   RefPtr<CSSRuleSourceData> rule = popRuleData();
@@ -454,15 +460,19 @@ bool verifyKeyframeKeyText(Document* document, const String& keyText) {
   CSSParser::parseSheetForInspector(parserContextForDocument(document),
                                     styleSheet, text, handler);
 
-  // Exactly two should be parsed.
+  // Exactly one should be parsed.
   unsigned ruleCount = sourceData.size();
-  if (ruleCount != 2 || sourceData.at(0)->type != StyleRule::Keyframes ||
-      sourceData.at(1)->type != StyleRule::Keyframe)
+  if (ruleCount != 1 || sourceData.at(0)->type != StyleRule::Keyframes)
+    return false;
+
+  const CSSRuleSourceData& keyframesData = *sourceData.at(0);
+  if (keyframesData.childRules.size() != 1 ||
+      keyframesData.childRules.at(0)->type != StyleRule::Keyframe)
     return false;
 
   // Exactly one property should be in keyframe rule.
   Vector<CSSPropertySourceData>& propertyData =
-      sourceData.at(1)->styleSourceData->propertyData;
+      keyframesData.childRules.at(0)->styleSourceData->propertyData;
   unsigned propertyCount = propertyData.size();
   if (propertyCount != 1)
     return false;