CSS Lazy Parsing perf jobs

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 11 matching lines @@
 
 class CORE_EXPORT CSSTokenizer {
   WTF_MAKE_NONCOPYABLE(CSSTokenizer);
   USING_FAST_MALLOC(CSSTokenizer);
 
  public:
   class CORE_EXPORT Scope {
     DISALLOW_NEW();
 
    public:
+    Scope() {}
     Scope(const String&);
     Scope(const String&, CSSParserObserverWrapper&);  // For the inspector
 
     CSSParserTokenRange tokenRange();
     unsigned tokenCount();
 
+    std::unique_ptr<Vector<String>> releaseEscapedStrings() {
+      return std::move(m_stringPool);
+    }
+
    private:
-    void storeString(const String& string) { m_stringPool.append(string); }
+    void storeString(const String&);
     Vector<CSSParserToken, 32> m_tokens;
-    // We only allocate strings when escapes are used.
-    Vector<String> m_stringPool;
+
+    // We only allocate strings when escapes are used. This member is lazily
+    // initialized.
+    std::unique_ptr<Vector<String>> m_stringPool;
     String m_string;
 
     friend class CSSTokenizer;
   };
 
  private:
   CSSTokenizer(CSSTokenizerInputStream&, Scope&);
 
   CSSParserToken nextToken();
 
@@ skipping 61 matching lines @@
   static const CodePoint codePoints[];
 
   Vector<CSSParserTokenType, 8> m_blockStack;
   CSSTokenizerInputStream& m_input;
   Scope& m_scope;
 };
 
 }  // namespace blink
 
 #endif  // CSSTokenizer_h