Add Dart keyword symbols to the VM isolate

runtime/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_
@@ skipping 87 matching lines @@
     ScanContext* next;
     char string_delimiter;
     bool string_is_multiline;
     int  brace_level;
   };
 
   struct KeywordTable {
     Token::Kind kind;
     const char* keyword_chars;
     int keyword_len;
-    String* keyword_symbol;
+    const String* keyword_symbol;
   };
 
   // Rewind scanner position to token 0.
   void Reset();
 
-  // Initialize Scanner tables.
-  void InitKeywordTable();
-
   // Reads next lookahead character.
   void ReadChar();
 
   // Read and discard characters up to end of line.
   void SkipLine();
 
   // Recognizes token 'kind' and reads next character in input.
   void Recognize(Token::Kind kind) {
     ReadChar();
     current_token_.kind = kind;
@@ skipping 82 matching lines @@
   // The following fields keep track whether we are scanning a string literal
   // 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.
+
+  static KeywordTable keywords_[Token::numKeywords];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_