[WIP] Streaming CSS parser

third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.cpp b/third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.cpp
index b3d2ec5c849fbab7c3acbfb27b276ed83b41b87b..53e53ef7bdf4b206e654c6fa16495958c6b6d588 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSLazyParsingState.cpp
@@ -12,11 +12,9 @@
 namespace blink {
 
 CSSLazyParsingState::CSSLazyParsingState(const CSSParserContext& context,
-                                         Vector<String> escapedStrings,
                                          const String& sheetText,
                                          StyleSheetContents* contents)
     : m_context(context),
-      m_escapedStrings(std::move(escapedStrings)),
       m_sheetText(sheetText),
       m_owningContents(contents),
       m_parsedStyleRules(0),
@@ -28,9 +26,9 @@ CSSLazyParsingState::CSSLazyParsingState(const CSSParserContext& context,
 }
 
 CSSLazyPropertyParserImpl* CSSLazyParsingState::createLazyParser(
-    const CSSParserTokenRange& block) {
+    size_t blockOffset) {
   ++m_totalStyleRules;
-  return new CSSLazyPropertyParserImpl(std::move(block), this);
+  return new CSSLazyPropertyParserImpl(blockOffset, this);
 }
 
 const CSSParserContext& CSSLazyParsingState::context() {
@@ -63,16 +61,7 @@ void CSSLazyParsingState::countRuleParsed() {
 }
 
 bool CSSLazyParsingState::shouldLazilyParseProperties(
-    const CSSSelectorList& selectors,
-    const CSSParserTokenRange& block) const {
-  // Simple heuristic for an empty block. Note that |block| here does not
-  // include {} brackets. We avoid lazy parsing empty blocks so we can avoid
-  // considering them when possible for matching. Lazy blocks must always be
-  // considered. Three tokens is a reasonable minimum for a block:
-  // ident ':' <value>.
-  if (block.end() - block.begin() <= 2)
-    return false;
-
+    const CSSSelectorList& selectors) const {
   //  Disallow lazy parsing for blocks which have before/after in their selector
   //  list. This ensures we don't cause a collectFeatures() when we trigger
   //  parsing for attr() functions which would trigger expensive invalidation