Move Rectangle and Point into dart:math.

sdk/lib/math/jenkins_smi_hash.dart

 // Copyright (c) 2013, 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.
-
-part of html_common;
+part of dart.math;
 
 /**
  * This is the [Jenkins hash function][1] but using masking to keep
  * values in SMI range.
  *
  * [1]: http://en.wikipedia.org/wiki/Jenkins_hash_function
  *
  * Use:
  * Hash each value with the hash of the previous value, then get the final
  * hash by calling finish.
  *
  *     var hash = 0;
  *     for (var value in values) {
  *       hash = JenkinsSmiHash.combine(hash, value.hashCode);
  *     }
  *     hash = JenkinsSmiHash.finish(hash);
  */
-class JenkinsSmiHash {
-  // TODO: Bug 11617- This class should be optimized and standardized elsewhere.
+class _JenkinsSmiHash {
+  // TODO(11617): This class should be optimized and standardized elsewhere.
 
   static int combine(int hash, int value) {
     hash = 0x1fffffff & (hash + value);
     hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
     return hash ^ (hash >> 6);
   }
 
   static int finish(int hash) {
     hash = 0x1fffffff & (hash + ((0x03ffffff & hash) <<  3));
     hash = hash ^ (hash >> 11);
     return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
   }
 
   static int hash2(a, b) => finish(combine(combine(0, a), b));
 
   static int hash4(a, b, c, d) =>
       finish(combine(combine(combine(combine(0, a), b), c), d));
 }