Changes to shrink the token stream representation from two words to one word.

vm/scanner.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Scanner class for the Dart language. The scanner reads source text
 // and produces a stream of tokens which is used by the parser.
 //
 
 #ifndef VM_SCANNER_H_
 #define VM_SCANNER_H_
 
 #include "vm/growable_array.h"
 #include "vm/token.h"
 
 namespace dart {
 
 // Forward declarations.
+class Array;
 class Library;
 class RawString;
 class String;
 
 // A call to Scan() scans the source one token at at time.
 // The scanned token is returned by cur_token().
 // GetStream() scans the entire source text and returns a stream of tokens.
 class Scanner : ValueObject {
  public:
   // SourcePosition describes a text location in user friendly
@@ skipping 175 matching lines @@
   // and its interpolated expressions.
   ScanContext* saved_context_;
   int32_t string_delimiter_;
   bool string_is_multiline_;
   int brace_level_;
 
   const String& private_key_;
 
   SourcePosition c0_pos_;      // Source position of lookahead character c0_.
   KeywordTable keywords_[Token::numKeywords];
+  Array& keyword_symbol_table_;  // Access to keyword symbols in object store.
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_