Modern-ify KeyEvent handling.

tests/html/interactive_test.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.
 
 library interactive_test;
 
 import 'dart:async';
 import 'dart:html';
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
@@ skipping 75 matching lines @@
           });
 
           document.body.append(video);
           video.src = url;
 
           return completer.future;
         });
       });
     }
   });
+
+  group('KeyEvent', () {
+    keydownHandlerTest(KeyEvent e) {
+      document.body.innerHtml =
+          '${document.body.innerHtml}KeyDOWN: CharCode: ${e.charCode}, KeyCode:'
+          ' ${e.keyCode}<br />';
+      expect(e.charCode, 0);
+    }
+    keypressHandlerTest(KeyEvent e) {
+      document.body.innerHtml =
+          '${document.body.innerHtml}KeyPRESS: CharCode: ${e.charCode}, '
+          'KeyCode: ${e.keyCode}<br />';
+    }
+    keyupHandlerTest(KeyEvent e) {
+      document.body.innerHtml =
+          '${document.body.innerHtml}KeyUP: CharCode: ${e.charCode}, KeyCode:'
+          ' ${e.keyCode}<br />';
+      expect(e.charCode, 0);
+    }
+    keyupHandlerTest2(KeyEvent e) {
+      document.body.innerHtml =
+          '${document.body.innerHtml}A second KeyUP handler: CharCode: '
+          '${e.charCode}, KeyCode: ${e.keyCode}<br />';
+      expect(e.charCode, 0);
+    }
+    test('keys', () {
+      document.body.innerHtml =
+          '${document.body.innerHtml}To test keyboard event values, press some '
+          'keys on your keyboard.<br /><br />The charcode for keydown and keyup'
+          ' should be 0, and the keycode should (generally) be populated with a'
+          ' value. Keycode and charcode should both have values for the '
+          'keypress event.';
+      new KeyboardEventStream.onKeyDown(document.body).listen(
+          keydownHandlerTest);
+      new KeyboardEventStream.onKeyPress(document.body).listen(
+          keypressHandlerTest);
+      new KeyboardEventStream.onKeyUp(document.body).listen(
+          keyupHandlerTest);
+      new KeyboardEventStream.onKeyUp(document.body).listen(
+          keyupHandlerTest2);
+    });
+  });
 }