Move Rectangle and Point into dart:math.

pkg/custom_element/lib/custom_element.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.
 
 /**
  * Custom DOM elements.
  *
  * This library provides access to the Polymer project's
  * [Custom Elements]
  * (http://www.polymer-project.org/platform/custom-elements.html)
@@ skipping 463 matching lines @@
 
   @deprecated
   int get clientLeft => client.left;
 
   @deprecated
   int get clientTop => client.top;
 
   @deprecated
   int get clientWidth => client.width;
 
-  Rect get client => host.client;
+  Rectangle get client => host.client;
 
   @deprecated
   int get offsetHeight => offset.height;
 
   @deprecated
   int get offsetLeft => offset.left;
 
   @deprecated
   int get offsetTop => offset.top;
 
   @deprecated
   int get offsetWidth => offset.width;
 
-  Rect get offset => host.offset;
+  Rectangle get offset => host.offset;
 
   int get scrollHeight => host.scrollHeight;
 
   int get scrollLeft => host.scrollLeft;
 
   int get scrollTop => host.scrollTop;
 
   set scrollLeft(int value) { host.scrollLeft = value; }
 
   set scrollTop(int value) { host.scrollTop = value; }
 
   int get scrollWidth => host.scrollWidth;
 
-  Rect getBoundingClientRect() => host.getBoundingClientRect();
+  Rectangle getBoundingClientRect() => host.getBoundingClientRect();
 
-  List<Rect> getClientRects() => host.getClientRects();
+  List<Rectangle> getClientRects() => host.getClientRects();
 
   List<Node> getElementsByClassName(String name) =>
       host.getElementsByClassName(name);
 
   Node get firstChild => host.firstChild;
 
   Node get lastChild => host.lastChild;
 
   String get localName => host.localName;
 
@@ skipping 122 matching lines @@
       for (var removed in record.removedNodes) {
         if (identical(node, removed)) {
           observer.disconnect();
           element.removed();
           return;
         }
       }
     }
   }).observe(element.parentNode, childList: true);
 }