Replace intptr_t with TokenDescriptor

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_
 
 #include "vm/growable_array.h"
 #include "vm/token.h"
+#include "vm/token_position.h"
 
 namespace dart {
 
 // Forward declarations.
 class Array;
 class Library;
 class RawString;
 class ScanContext;
 class String;
 
@@ skipping 24 matching lines @@
 
   // Initializes scanner to scan string source.
   Scanner(const String& source, const String& private_key);
   ~Scanner();
 
   // Scans one token at a time.
   void Scan();
 
   // Scans to specified token position.
   // Use CurrentPosition() to extract position.
-  void ScanTo(intptr_t token_index);
+  void ScanTo(TokenPosition token_index);
 
   // Scans entire source and returns a stream of tokens.
   // Should be called only once.
   const GrowableTokenStream& GetStream();
 
   // Info about most recently recognized token.
   const TokenDescriptor& current_token() const { return current_token_; }
 
   // Was there a line break before the current token?
   bool NewlineBeforeToken() const { return newline_seen_; }
@@ skipping 142 matching lines @@
   Zone* zone_;
 
   static KeywordTable keywords_[Token::kNumKeywords];
   static int keywords_char_offset_[kNumLowercaseChars];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_