NOT FOR LANDING: Hack up CSSParser for speed.

third_party/WebKit/Source/core/css/parser/CSSTokenizer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSTokenizer_h
 #define CSSTokenizer_h
 
 #include "core/CoreExport.h"
 #include "core/css/parser/CSSParserToken.h"
 #include "core/html/parser/InputStreamPreprocessor.h"
@@ skipping 17 matching lines @@
         DISALLOW_NEW();
     public:
         Scope(const String&);
         Scope(const String&, CSSParserObserverWrapper&); // For the inspector
 
         CSSParserTokenRange tokenRange();
         unsigned tokenCount();
 
     private:
         void storeString(const String& string) { m_stringPool.append(string); }
-        Vector<CSSParserToken> m_tokens;
+        Vector<CSSParserToken, 32> m_tokens;

[esprehn, 2016/04/22 23:30:58]

Lots of malloc in the profiles. By using inline capacity here I saved a bunch of
time.

         // We only allocate strings when escapes are used.
         Vector<String> m_stringPool;
         String m_string;
 
         friend class CSSTokenizer;
     };
 
 private:
     CSSTokenizer(CSSTokenizerInputStream&, Scope&);
 
@@ skipping 24 matching lines @@
     bool nextCharsAreNumber();
     bool nextCharsAreIdentifier(UChar);
     bool nextCharsAreIdentifier();
     CSSParserToken blockStart(CSSParserTokenType);
     CSSParserToken blockStart(CSSParserTokenType blockType, CSSParserTokenType, CSSParserString);
     CSSParserToken blockEnd(CSSParserTokenType, CSSParserTokenType startType);
 
     using CodePoint = CSSParserToken (CSSTokenizer::*)(UChar);
 
     static const CodePoint codePoints[];
-    Vector<CSSParserTokenType> m_blockStack;
+    Vector<CSSParserTokenType, 8> m_blockStack;

[esprehn, 2016/04/22 23:30:58]

ditto

 
     CSSParserToken whiteSpace(UChar);
     CSSParserToken leftParenthesis(UChar);
     CSSParserToken rightParenthesis(UChar);
     CSSParserToken leftBracket(UChar);
     CSSParserToken rightBracket(UChar);
     CSSParserToken leftBrace(UChar);
     CSSParserToken rightBrace(UChar);
     CSSParserToken plusOrFullStop(UChar);
     CSSParserToken comma(UChar);
@@ skipping 20 matching lines @@
 
     CSSTokenizerInputStream& m_input;
     Scope& m_scope;
 };
 
 
 
 } // namespace blink
 
 #endif // CSSTokenizer_h