Update partial parser and scanner to be able to skip expressions like "new Map<S, T>()".

dart/lib/compiler/implementation/scanner/scanner.dart

 // Copyright (c) 2012, 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.
 
 interface Scanner {
   Token tokenize();
 }
 
 /**
  * Common base class for a Dart scanner.
@@ skipping 323 matching lines @@
     next = advance();
     if (next === $EQ) {
       return select($EQ, BANG_EQ_EQ_INFO, BANG_EQ_INFO);
     }
     appendPrecedenceToken(BANG_INFO);
     return next;
   }
 
   int tokenizeEquals(int next) {
     // = == ===
+    discardOpenLt();
     next = advance();
     if (next === $EQ) {
       return select($EQ, EQ_EQ_EQ_INFO, EQ_EQ_INFO);
     } else if (next === $GT) {
       appendPrecedenceToken(FUNCTION_INFO);
       return advance();
     }
     appendPrecedenceToken(EQ_INFO);
     return next;
   }
@@ skipping 407 matching lines @@
                                       charOffset);
   }
 }
 
 class MalformedInputException {
   final String message;
   final position;
   MalformedInputException(this.message, this.position);
   toString() => message;
 }