move tip to utils so it can be picked up in the SDK

utils/tip/tip.dart

 // 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.
 
 /**
  * This giant file has pieces for compiling dart in the browser, injecting
  * scripts into pages and a bunch of classes to build a simple dart editor.
  *
  * TODO(jimhug): Separate these pieces cleanly.
  */
 
 #import('dart:dom');
-#import('../lang.dart');
-#import('../file_system_dom.dart');
+#import('../../frog/lang.dart');
+#import('../../frog/file_system_dom.dart');
 
 
 void main() {
   final systemPath = getRootPath(window) + '/..';
   final userPath = getRootPath(window.parent);
 
   if (window !== window.parent) {
     // I'm in an iframe - frogify my surrounding code unless dart is native.
     if (!document.implementation.hasFeature('dart', '')) {
       // Suppress warnings to avoid diff-based tests from failing on them.
@@ skipping 1590 matching lines @@
       return Classification.KEYWORD;
 
     case TokenKind.WHITESPACE:
     case TokenKind.END_OF_FILE:
       return Classification.NONE;
 
     default:
       return Classification.NONE;
   }
 }