Introduce newline tokens into the token stream.

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 185 matching lines @@
   }
 
   // Reads a number literal.
   void ScanNumber(bool dec_point_seen);
 
   void ScanScriptTag();
 
   static void PrintTokens(const GrowableTokenStream& ts);
 
   TokenDescriptor current_token_;  // Current token.
+  TokenDescriptor newline_token_;  // Newline token.
   const String& source_;           // The source text being tokenized.
   intptr_t source_length_;     // The length of the source text.
   intptr_t lookahead_pos_;     // Position of lookahead character
                                // within source_.
   intptr_t token_start_;       // Begin of current token in src_.
   int32_t c0_;                 // Lookahead character.
   bool newline_seen_;          // Newline before current token.
+  intptr_t prev_token_line_;   // Line number of the previous token.
 
   // 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.
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_