Add List.first.

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 b861dc410c589aa6304839e36f9e136a1d10d9d0..8e88ebff0dcc1e265e0c4f299359bfa8bdb76e74 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -7374,6 +7374,8 @@ class DOMMimeTypeArray extends NativeFieldWrapperClass1 implements List<DOMMimeT
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  DOMMimeType get first => this[0];
+
   DOMMimeType get last => this[length - 1];
 
   DOMMimeType removeLast() {
@@ -7535,6 +7537,8 @@ class DOMPluginArray extends NativeFieldWrapperClass1 implements List<DOMPlugin>
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  DOMPlugin get first => this[0];
+
   DOMPlugin get last => this[length - 1];
 
   DOMPlugin removeLast() {
@@ -9255,6 +9259,11 @@ class _ChildrenElementList implements List {
     return result;
   }
 
+  Element get first {
+    return _element.$dom_firstElementChild;
+  }
+
+
   Element get last {
     return _element.$dom_lastElementChild;
   }
@@ -9269,10 +9278,6 @@ class _FrozenElementList implements List {
 
   _FrozenElementList._wrap(this._nodeList);
 
-  Element get first {
-    return _nodeList[0];
-  }
-
   bool contains(Element element) {
     for (Element el in this) {
       if (el == element) return true;
@@ -9381,6 +9386,8 @@ class _FrozenElementList implements List {
     throw new UnsupportedError('');
   }
 
+  Element get first => _nodeList.first;
+
   Element get last => _nodeList.last;
 }
 
@@ -11347,6 +11354,8 @@ class Float32Array extends ArrayBufferView implements List<num> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  num get first => this[0];
+
   num get last => this[length - 1];
 
   num removeLast() {
@@ -11478,6 +11487,8 @@ class Float64Array extends ArrayBufferView implements List<num> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  num get first => this[0];
+
   num get last => this[length - 1];
 
   num removeLast() {
@@ -12055,6 +12066,8 @@ class HTMLAllCollection extends NativeFieldWrapperClass1 implements List<Node> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Node get first => this[0];
+
   Node get last => this[length - 1];
 
   Node removeLast() {
@@ -12166,6 +12179,8 @@ class HTMLCollection extends NativeFieldWrapperClass1 implements List<Node> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Node get first => this[0];
+
   Node get last => this[length - 1];
 
   Node removeLast() {
@@ -14495,6 +14510,8 @@ class Int16Array extends ArrayBufferView implements List<int> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  int get first => this[0];
+
   int get last => this[length - 1];
 
   int removeLast() {
@@ -14626,6 +14643,8 @@ class Int32Array extends ArrayBufferView implements List<int> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  int get first => this[0];
+
   int get last => this[length - 1];
 
   int removeLast() {
@@ -14757,6 +14776,8 @@ class Int8Array extends ArrayBufferView implements List<int> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  int get first => this[0];
+
   int get last => this[length - 1];
 
   int removeLast() {
@@ -17648,6 +17669,8 @@ class NamedNodeMap extends NativeFieldWrapperClass1 implements List<Node> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Node get first => this[0];
+
   Node get last => this[length - 1];
 
   Node removeLast() {
@@ -18248,6 +18271,8 @@ class _ListWrapper<E> implements List<E> {
 
   E removeLast() => _list.removeLast();
 
+  E get first => _list.first;
+
   E get last => _list.last;
 
   List<E> getRange(int start, int rangeLength) =>
@@ -18261,8 +18286,6 @@ class _ListWrapper<E> implements List<E> {
 
   void insertRange(int start, int rangeLength, [E initialValue = null]) =>
     _list.insertRange(start, rangeLength, initialValue);
-
-  E get first => _list[0];
 }
 
 /**
@@ -20663,6 +20686,8 @@ class SQLResultSetRowList extends NativeFieldWrapperClass1 implements List<Map>
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Map get first => this[0];
+
   Map get last => this[length - 1];
 
   Map removeLast() {
@@ -21381,6 +21406,8 @@ class SourceBufferList extends EventTarget implements List<SourceBuffer> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  SourceBuffer get first => this[0];
+
   SourceBuffer get last => this[length - 1];
 
   SourceBuffer removeLast() {
@@ -21580,6 +21607,8 @@ class SpeechGrammarList extends NativeFieldWrapperClass1 implements List<SpeechG
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  SpeechGrammar get first => this[0];
+
   SpeechGrammar get last => this[length - 1];
 
   SpeechGrammar removeLast() {
@@ -23241,6 +23270,8 @@ class TextTrackCueList extends NativeFieldWrapperClass1 implements List<TextTrac
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  TextTrackCue get first => this[0];
+
   TextTrackCue get last => this[length - 1];
 
   TextTrackCue removeLast() {
@@ -23354,6 +23385,8 @@ class TextTrackList extends EventTarget implements List<TextTrack> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  TextTrack get first => this[0];
+
   TextTrack get last => this[length - 1];
 
   TextTrack removeLast() {
@@ -23625,6 +23658,8 @@ class TouchList extends NativeFieldWrapperClass1 implements List<Touch> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Touch get first => this[0];
+
   Touch get last => this[length - 1];
 
   Touch removeLast() {
@@ -23993,6 +24028,8 @@ class Uint16Array extends ArrayBufferView implements List<int> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  int get first => this[0];
+
   int get last => this[length - 1];
 
   int removeLast() {
@@ -24124,6 +24161,8 @@ class Uint32Array extends ArrayBufferView implements List<int> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  int get first => this[0];
+
   int get last => this[length - 1];
 
   int removeLast() {
@@ -24255,6 +24294,8 @@ class Uint8Array extends ArrayBufferView implements List<int> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  int get first => this[0];
+
   int get last => this[length - 1];
 
   int removeLast() {
@@ -26939,6 +26980,8 @@ class _CSSRuleList extends NativeFieldWrapperClass1 implements List<CSSRule> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  CSSRule get first => this[0];
+
   CSSRule get last => this[length - 1];
 
   CSSRule removeLast() {
@@ -27042,6 +27085,8 @@ class _CSSValueList extends CSSValue implements List<CSSValue> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  CSSValue get first => this[0];
+
   CSSValue get last => this[length - 1];
 
   CSSValue removeLast() {
@@ -27145,6 +27190,8 @@ class _ClientRectList extends NativeFieldWrapperClass1 implements List<ClientRec
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  ClientRect get first => this[0];
+
   ClientRect get last => this[length - 1];
 
   ClientRect removeLast() {
@@ -27256,6 +27303,8 @@ class _DOMStringList extends NativeFieldWrapperClass1 implements List<String> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  String get first => this[0];
+
   String get last => this[length - 1];
 
   String removeLast() {
@@ -27812,6 +27861,8 @@ class _EntryArray extends NativeFieldWrapperClass1 implements List<Entry> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Entry get first => this[0];
+
   Entry get last => this[length - 1];
 
   Entry removeLast() {
@@ -27915,6 +27966,8 @@ class _EntryArraySync extends NativeFieldWrapperClass1 implements List<EntrySync
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  EntrySync get first => this[0];
+
   EntrySync get last => this[length - 1];
 
   EntrySync removeLast() {
@@ -28026,6 +28079,8 @@ class _FileList extends NativeFieldWrapperClass1 implements List<File> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  File get first => this[0];
+
   File get last => this[length - 1];
 
   File removeLast() {
@@ -28153,6 +28208,8 @@ class _GamepadList extends NativeFieldWrapperClass1 implements List<Gamepad> {
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Gamepad get first => this[0];
+
   Gamepad get last => this[length - 1];
 
   Gamepad removeLast() {
@@ -28305,6 +28362,8 @@ class _MediaStreamList extends NativeFieldWrapperClass1 implements List<MediaStr
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  MediaStream get first => this[0];
+
   MediaStream get last => this[length - 1];
 
   MediaStream removeLast() {
@@ -28512,6 +28571,8 @@ class _SpeechInputResultList extends NativeFieldWrapperClass1 implements List<Sp
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  SpeechInputResult get first => this[0];
+
   SpeechInputResult get last => this[length - 1];
 
   SpeechInputResult removeLast() {
@@ -28623,6 +28684,8 @@ class _SpeechRecognitionResultList extends NativeFieldWrapperClass1 implements L
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  SpeechRecognitionResult get first => this[0];
+
   SpeechRecognitionResult get last => this[length - 1];
 
   SpeechRecognitionResult removeLast() {
@@ -28726,6 +28789,8 @@ class _StyleSheetList extends NativeFieldWrapperClass1 implements List<StyleShee
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  StyleSheet get first => this[0];
+
   StyleSheet get last => this[length - 1];
 
   StyleSheet removeLast() {
@@ -28837,6 +28902,8 @@ class _WebKitAnimationList extends NativeFieldWrapperClass1 implements List<Anim
     return _Lists.lastIndexOf(this, element, start);
   }
 
+  Animation get first => this[0];
+
   Animation get last => this[length - 1];
 
   Animation removeLast() {
@@ -29175,6 +29242,8 @@ class FilteredElementList implements List {
     return _filtered.lastIndexOf(element, start);
   }
 
+  Element get first => _filtered.first;
+
   Element get last => _filtered.last;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file