Converting Element.client*, offset* and Screen.avail* over to Rects

tests/html/element_test.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.
 
 library ElementTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html';
 import 'dart:svg' as svg;
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       final container = new Element.tag("div");
       container.style.position = 'absolute';
       container.style.top = '8px';
       container.style.left = '8px';
       final element = new Element.tag("div");
       element.style.width = '200px';
       element.style.height = '200px';
       container.children.add(element);
       document.body.children.add(container);
 
-      expect(element.clientWidth, greaterThan(100));
-      expect(element.clientHeight, greaterThan(100));
-      expect(element.offsetWidth, greaterThan(100));
-      expect(element.offsetHeight, greaterThan(100));
+      expect(element.client.width, greaterThan(100));
+      expect(element.client.height, greaterThan(100));
+      expect(element.offset.width, greaterThan(100));
+      expect(element.offset.height, greaterThan(100));
       expect(element.scrollWidth, greaterThan(100));
       expect(element.scrollHeight, greaterThan(100));
       expect(element.getBoundingClientRect().left, 8);
       expect(element.getBoundingClientRect().top, 8);
       container.remove();
     });
   });
 
   group('constructors', () {
     test('error', () {
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     });
 
     test('getRange', () {
       var range = makeElList().getRange(1, 2);
       expect(range, isElementList);
       expect(range[0], isImageElement);
       expect(range[1], isInputElement);
     });
   });
 }