NOT FOR LANDING: Hack up CSSParser for speed.

third_party/WebKit/Source/core/css/parser/CSSParserTokenRange.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 CSSParserTokenRange_h
 #define CSSParserTokenRange_h
 
 #include "core/CoreExport.h"
 #include "core/css/parser/CSSParserToken.h"
 #include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 CORE_EXPORT extern const CSSParserToken& staticEOFToken;
 
 // A CSSParserTokenRange is an iterator over a subrange of a vector of CSSParserTokens.
 // Accessing outside of the range will return an endless stream of EOF tokens.
 // This class refers to half-open intervals [first, last).
 class CORE_EXPORT CSSParserTokenRange {
     DISALLOW_NEW();
 public:
-    CSSParserTokenRange(const Vector<CSSParserToken>& vector)

[esprehn, 2016/04/22 23:30:57]

We could also use a template I suppose to allow inline capacity here. I think
this should probably be explicit though.

[Timothy Loh, 2016/04/27 06:52:05]

IIRC I set it up so that once you have a CSSParserTokenRange you can only create
additional ranges by using makeSubRange. I think this was so that if you
consume() past the end and get the staticEOF token you can still make a range
and it gets the correct last value.

A template is probably fine because you can (I think?) write template<size_t
inlineBuffer> CSSParserTokenRange(const Vector<CSSParserToken, inlineBuffer>&
vector). Maybe it'd be easier to just using CSSParserTokenVector =
Vector<CSSParserToken, 32> and use that everywhere though.

-    : m_first(vector.begin())
-    , m_last(vector.end())
+    CSSParserTokenRange(const CSSParserToken* first, const CSSParserToken* last)
+        : m_first(first)
+        , m_last(last)
     {
     }
 
     // This should be called on a range with tokens returned by that range.
     CSSParserTokenRange makeSubRange(const CSSParserToken* first, const CSSParserToken* last) const;
 
     bool atEnd() const { return m_first == m_last; }
     const CSSParserToken* end() const { return m_last; }
 
     const CSSParserToken& peek(unsigned offset = 0) const
@@ skipping 28 matching lines @@
             ++m_first;
     }
 
     String serialize() const;
 
     const CSSParserToken* begin() const { return m_first; }
 
     static void initStaticEOFToken();
 
 private:
-    CSSParserTokenRange(const CSSParserToken* first, const CSSParserToken* last)
-    : m_first(first)
-    , m_last(last)
-    { }
-
     const CSSParserToken* m_first;
     const CSSParserToken* m_last;
 };
 
 } // namespace blink
 
 #endif // CSSParserTokenRange_h