Fix more warnings for dart:html.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 7a17fb68de4620c73b5f9dba59f50447450b56d6..92c3755a5f8a3aed4a37150a7712fc75a69d3263 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -101,7 +101,7 @@ HtmlDocument get document {
 
 @DocsEditable()
 @DomName('AbstractWorker')
-class AbstractWorker extends NativeFieldWrapperClass2 implements EventTarget {
+abstract class AbstractWorker extends NativeFieldWrapperClass2 implements EventTarget {
   // To suppress missing implicit constructor warnings.
   factory AbstractWorker._() { throw new UnsupportedError("Not supported"); }
 
@@ -304,6 +304,12 @@ class AnchorElement extends HtmlElement implements UrlUtils {
   @DocsEditable()
   void set href(String value) native "HTMLAnchorElement_href_Setter";
 
+  @DomName('HTMLAnchorElement.origin')
+  @DocsEditable()
+  // WebKit only
+  @Experimental() // non-standard
+  String get origin native "HTMLAnchorElement_origin_Getter";
+
   @DomName('HTMLAnchorElement.password')
   @DocsEditable()
   @Experimental() // untriaged
@@ -8291,13 +8297,16 @@ class DocumentFragment extends Node implements ParentNode {
         validator: validator, treeSanitizer: treeSanitizer);
   }
 
-  List<Element> _children;
+  HtmlCollection get _children => throw new UnimplementedError(
+      'Use _docChildren instead');
+
+  List<Element> _docChildren;
 
   List<Element> get children {
-    if (_children == null) {
-      _children = new FilteredElementList(this);
+    if (_docChildren == null) {
+      _docChildren = new FilteredElementList(this);
     }
-    return _children;
+    return _docChildren;
   }
 
   void set children(List<Element> value) {
@@ -8427,7 +8436,7 @@ class DocumentFragment extends Node implements ParentNode {
 @DomName('DocumentType')
 // http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-412266927
 @deprecated // stable
-class DocumentType extends Node implements ChildNode {
+abstract class DocumentType extends Node implements ChildNode {
   // To suppress missing implicit constructor warnings.
   factory DocumentType._() { throw new UnsupportedError("Not supported"); }
 
@@ -11186,8 +11195,6 @@ abstract class Element extends Node implements GlobalEventHandlers, ParentNode,
 
   bool hidden;
 
-  InputMethodContext get inputMethodContext;
-
   bool get isContentEditable;
 
   String lang;
@@ -15596,10 +15603,6 @@ class HtmlFormControlsCollection extends HtmlCollection {
   // To suppress missing implicit constructor warnings.
   factory HtmlFormControlsCollection._() { throw new UnsupportedError("Not supported"); }
 
-  @DomName('HTMLFormControlsCollection.__getter__')
-  @DocsEditable()
-  Node __getter__(int index) native "HTMLFormControlsCollection___getter___Callback";
-
   @DomName('HTMLFormControlsCollection.namedItem')
   @DocsEditable()
   Node namedItem(String name) native "HTMLFormControlsCollection_namedItem_Callback";
@@ -28922,13 +28925,13 @@ class Url extends NativeFieldWrapperClass2 implements UrlUtils {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_1(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_2(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_3(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_4(blob_OR_source_OR_stream);
     }
     throw new ArgumentError("Incorrect number or type of arguments");
@@ -31603,6 +31606,15 @@ class _BeforeUnloadEventStreamProvider implements
   String getEventType(EventTarget target) {
     return _eventType;
   }
+
+  ElementStream<BeforeUnloadEvent> forElement(Element e, {bool useCapture: false}) {
+    return new _ElementEventStreamImpl(e, _eventType, useCapture);
+  }
+
+  ElementStream<BeforeUnloadEvent> _forElementList(ElementList e,
+      {bool useCapture: false}) {
+    return new _ElementListEventStreamImpl(e, _eventType, useCapture);
+  }
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
@@ -31641,11 +31653,6 @@ abstract class WindowEventHandlers extends EventTarget {
   // To suppress missing implicit constructor warnings.
   factory WindowEventHandlers._() { throw new UnsupportedError("Not supported"); }
 
-  @DomName('WindowEventHandlers.beforeunloadEvent')
-  @DocsEditable()
-  @Experimental() // untriaged
-  static const EventStreamProvider<Event> beforeUnloadEvent = const EventStreamProvider<Event>('beforeunload');
-
   @DomName('WindowEventHandlers.hashchangeEvent')
   @DocsEditable()
   @Experimental() // untriaged
@@ -31686,11 +31693,6 @@ abstract class WindowEventHandlers extends EventTarget {
   @Experimental() // untriaged
   static const EventStreamProvider<Event> unloadEvent = const EventStreamProvider<Event>('unload');
 
-  @DomName('WindowEventHandlers.onbeforeunload')
-  @DocsEditable()
-  @Experimental() // untriaged
-  Stream<Event> get onBeforeUnload => beforeUnloadEvent.forTarget(this);
-
   @DomName('WindowEventHandlers.onhashchange')
   @DocsEditable()
   @Experimental() // untriaged
@@ -33920,6 +33922,10 @@ abstract class _XMLHttpRequestProgressEvent extends ProgressEvent {
  */
 class _WrappedEvent implements Event {
   final Event wrapped;
+
+  /** The CSS selector involved with event delegation. */
+  String _selector;
+
   _WrappedEvent(this.wrapped);
 
   bool get bubbles => wrapped.bubbles;
@@ -33957,6 +33963,43 @@ class _WrappedEvent implements Event {
   void stopPropagation() {
     wrapped.stopPropagation();
   }
+
+  /**
+   * A pointer to the element whose CSS selector matched within which an event
+   * was fired. If this Event was not associated with any Event delegation,
+   * accessing this value will throw an [UnsupportedError].
+   */
+  Element get matchingTarget {
+    if (_selector == null) {
+      throw new UnsupportedError('Cannot call matchingTarget if this Event did'
+          ' not arise as a result of event delegation.');
+    }
+    var currentTarget = this.currentTarget;
+    var target = this.target;
+    var matchedTarget;
+    do {
+      if (target.matches(_selector)) return target;
+      target = target.parent;
+    } while (target != null && target != currentTarget.parent);
+    throw new StateError('No selector matched for populating matchedTarget.');
+  }
+
+  /**
+   * This event's path, taking into account shadow DOM.
+   *
+   * ## Other resources
+   *
+   * * [Shadow DOM extensions to Event]
+   * (http://w3c.github.io/webcomponents/spec/shadow/#extensions-to-event) from
+   * W3C.
+   */
+  // https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#extensions-to-event
+  @Experimental()
+  List<Node> get path => wrapped.path;
+
+  dynamic get _get_currentTarget => wrapped._get_currentTarget;
+
+  dynamic get _get_target => wrapped._get_target;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
@@ -34290,7 +34333,7 @@ abstract class CanvasImageSource {}
  * * [DOM Window](https://developer.mozilla.org/en-US/docs/DOM/window) from MDN.
  * * [Window](http://www.w3.org/TR/Window/) from the W3C.
  */
-abstract class WindowBase implements EventTarget {
+abstract class WindowBase {
   // Fields.
 
   /**
@@ -35363,6 +35406,9 @@ class _CustomEventStreamProvider<T extends Event>
   String getEventType(EventTarget target) {
     return _eventTypeGetter(target);
   }
+
+  String get _eventType =>
+      throw new UnsupportedError('Access type through getEventType method.');
 }
 // DO NOT EDIT- this file is generated from running tool/generator.sh.
 
@@ -38088,6 +38134,17 @@ class KeyEvent extends _WrappedEvent implements KeyboardEvent {
     throw new UnsupportedError(
         "Cannot initialize a KeyboardEvent from a KeyEvent.");
   }
+  int get _layerX => throw new UnsupportedError('Not applicable to KeyEvent');
+  int get _layerY => throw new UnsupportedError('Not applicable to KeyEvent');
+  int get _pageX => throw new UnsupportedError('Not applicable to KeyEvent');
+  int get _pageY => throw new UnsupportedError('Not applicable to KeyEvent');
+  @Experimental() // untriaged
+  bool getModifierState(String keyArgument) => throw new UnimplementedError();
+  @Experimental() // untriaged
+  int get location => throw new UnimplementedError();
+  @Experimental() // untriaged
+  bool get repeat => throw new UnimplementedError();
+  dynamic get _get_view => throw new UnimplementedError();
 }
 // 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
@@ -38585,7 +38642,7 @@ class _Utils {
     // TODO(vsm): Move these checks into native code.
     ClassMirror cls = reflectClass(type);
     if (_isBuiltinType(cls)) {
-      throw new UnsupportedError("Invalid custom element from ${cls.owner.uri}.");
+      throw new UnsupportedError("Invalid custom element from ${(cls.owner as LibraryMirror).uri}.");
     }
     var className = MirrorSystem.getName(cls.simpleName);
     var createdConstructor = cls.declarations[new Symbol('$className.created')];