Roll Observatory packages and add a roll script

packages/dart_style/lib/src/whitespace.dart

 // Copyright (c) 2014, 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.
 
 library dart_style.src.whitespace;
 
 /// Constants for the number of spaces for various kinds of indentation.
 class Indent {
   /// The number of spaces in a block or collection body.
   static const block = 2;
@@ skipping 85 matching lines @@
 
       default:
         return 0;
     }
   }
 
   const Whitespace._(this.name);
 
   String toString() => name;
 }