Replace ScrollableList with ScrollableList2

ScrollableList2 is complete and subsumes all the use cases for the original
ScrollableList.

examples/fitness/lib/feed.dart

@@ -14,7 +14,7 @@ class FitnessItemList extends StatelessComponent {
   final FitnessItemHandler onDismissed;
 
   Widget build(BuildContext context) {
-    return new ScrollableList2(
+    return new ScrollableList(
       padding: const EdgeDims.all(4.0),
       itemExtent: kFitnessItemHeight,
       children: items.map((FitnessItem item) => item.toRow(onDismissed: onDismissed))

examples/stocks/lib/stock_list.dart

@@ -14,7 +14,7 @@ class StockList extends StatelessComponent {
   final StockRowActionCallback onAction;
 
   Widget build(BuildContext context) {
-    return new ScrollableList2(
+    return new ScrollableList(
       itemExtent: StockRow.kHeight,
       children: stocks.map((Stock stock) {
         return new StockRow(

examples/widgets/card_collection.dart

@@ -393,7 +393,7 @@ class CardCollectionState extends State<CardCollection> {
   Widget build(BuildContext context) {
     Widget cardCollection;
     if (_fixedSizeCards) {
-      cardCollection = new ScrollableList2 (
+      cardCollection = new ScrollableList (
         snapOffsetCallback: _snapToCenter ? _toSnapOffset : null,
         snapAlignmentOffset: _cardCollectionSize.height / 2.0,
         itemExtent: _cardModels[0].height,

examples/widgets/media_query.dart

@@ -72,7 +72,7 @@ class MediaQueryExample extends StatelessComponent {
       items.add(new AdaptiveItem("Item $i"));
 
     if (MediaQuery.of(context).size.width < _gridViewBreakpoint) {
-      return new ScrollableList2(
+      return new ScrollableList(
         itemExtent: 50.0,
         children: items.map((AdaptiveItem item) => item.toListItem())
       );

examples/widgets/scrollbar.dart

@@ -30,7 +30,7 @@ class ScrollbarAppState extends State<ScrollbarApp> {
   final ScrollbarPainter _scrollbarPainter = new ScrollbarPainter();
 
   Widget _buildMenu(BuildContext context) {
-    return new ScrollableList2(
+    return new ScrollableList(
       itemExtent: _itemExtent,
       scrollableListPainter: _scrollbarPainter,
       children: new List<Widget>.generate(_itemCount, (int i) => new _Item(i))

packages/flutter/lib/src/material/material_list.dart

@@ -42,7 +42,7 @@ class _MaterialListState extends State<MaterialList> {
   ScrollbarPainter _scrollbarPainter = new ScrollbarPainter();
 
   Widget build(BuildContext context) {
-    return new ScrollableList2(
+    return new ScrollableList(
       initialScrollOffset: config.initialScrollOffset,
       scrollDirection: ScrollDirection.vertical,
       onScroll: config.onScroll,

packages/flutter/lib/src/widgets/scrollable.dart

@@ -666,59 +666,6 @@ abstract class ScrollableWidgetListState<T extends ScrollableWidgetList> extends
 
 typedef Widget ItemBuilder<T>(BuildContext context, T item, int index);
 
-/// A wrapper around [ScrollableWidgetList] that helps you translate a list of
-/// model objects into a scrollable list of widgets. Assumes all the widgets
-/// have the same height.
-class ScrollableList<T> extends ScrollableWidgetList {
-  ScrollableList({
-    Key key,
-    double initialScrollOffset,
-    ScrollDirection scrollDirection: ScrollDirection.vertical,
-    ScrollListener onScroll,
-    SnapOffsetCallback snapOffsetCallback,
-    double snapAlignmentOffset: 0.0,
-    this.items,
-    this.itemBuilder,
-    bool itemsWrap: false,
-    double itemExtent,
-    EdgeDims padding,
-    ScrollableListPainter scrollableListPainter
-  }) : super(
-    key: key,
-    initialScrollOffset: initialScrollOffset,
-    scrollDirection: scrollDirection,
-    onScroll: onScroll,
-    snapOffsetCallback: snapOffsetCallback,
-    snapAlignmentOffset: snapAlignmentOffset,
-    itemsWrap: itemsWrap,
-    itemExtent: itemExtent,
-    padding: padding,
-    scrollableListPainter: scrollableListPainter
-  );
-
-  final List<T> items;
-  final ItemBuilder<T> itemBuilder;
-
-  ScrollableListState<T, ScrollableList<T>> createState() => new ScrollableListState<T, ScrollableList<T>>();
-}
-
-class ScrollableListState<T, Config extends ScrollableList<T>> extends ScrollableWidgetListState<Config> {
-  ScrollBehavior createScrollBehavior() {
-    return config.itemsWrap ? new UnboundedBehavior() : super.createScrollBehavior();
-  }
-
-  int get itemCount => config.items.length;
-
-  List<Widget> buildItems(BuildContext context, int start, int count) {
-    List<Widget> result = new List<Widget>();
-    int begin = config.itemsWrap ? start : math.max(0, start);
-    int end = config.itemsWrap ? begin + count : math.min(begin + count, config.items.length);
-    for (int i = begin; i < end; ++i)
-      result.add(config.itemBuilder(context, config.items[i % itemCount], i));
-    return result;
-  }
-}
-
 /// A general scrollable list for a large number of children that might not all
 /// have the same height. Prefer [ScrollableWidgetList] when all the children
 /// have the same height because it can use that property to be more efficient.

packages/flutter/lib/src/widgets/scrollable_list.dart

@@ -11,8 +11,8 @@ import 'virtual_viewport.dart';
 import 'package:flutter/animation.dart';
 import 'package:flutter/rendering.dart';
 
-class ScrollableList2 extends Scrollable {
-  ScrollableList2({
+class ScrollableList extends Scrollable {
+  ScrollableList({
     Key key,
     double initialScrollOffset,
     ScrollDirection scrollDirection: ScrollDirection.vertical,
@@ -44,7 +44,7 @@ class ScrollableList2 extends Scrollable {
   ScrollableState createState() => new _ScrollableList2State();
 }
 
-class _ScrollableList2State extends ScrollableState<ScrollableList2> {
+class _ScrollableList2State extends ScrollableState<ScrollableList> {
   ScrollBehavior createScrollBehavior() => new OverscrollBehavior();
   ExtentScrollBehavior get scrollBehavior => super.scrollBehavior;
 

packages/flutter/test/widget/dismissable_test.dart

@@ -38,7 +38,7 @@ Widget buildDismissableItem(int item) {
 Widget widgetBuilder() {
   return new Container(
     padding: const EdgeDims.all(10.0),
-    child: new ScrollableList2(
+    child: new ScrollableList(
       scrollDirection: scrollDirection,
       itemExtent: itemExtent,
       children: <int>[0, 1, 2, 3, 4].where(

packages/flutter/test/widget/reparent_state_test.dart

@@ -99,7 +99,7 @@ void main() {
 
       (key.currentState as StateMarkerState).marker = "marked";
 
-      tester.pumpWidget(new ScrollableList2(
+      tester.pumpWidget(new ScrollableList(
         itemExtent: 100.0,
         children: <Widget>[
           new Container(

packages/flutter/test/widget/scrollable_list_hit_testing_test.dart

@@ -17,7 +17,7 @@ void main() {
       tester.pumpWidget(new Center(
         child: new Container(
           height: 50.0,
-          child: new ScrollableList2(
+          child: new ScrollableList(
             key: new GlobalKey(),
             itemExtent: 290.0,
             scrollDirection: ScrollDirection.horizontal,
@@ -57,7 +57,7 @@ void main() {
       tester.pumpWidget(new Center(
         child: new Container(
           width: 50.0,
-          child: new ScrollableList2(
+          child: new ScrollableList(
             key: new GlobalKey(),
             itemExtent: 290.0,
             scrollDirection: ScrollDirection.vertical,

packages/flutter/test/widget/scrollable_list_horizontal_test.dart

@@ -13,7 +13,7 @@ Widget buildFrame() {
   return new Center(
     child: new Container(
       height: 50.0,
-      child: new ScrollableList2(
+      child: new ScrollableList(
         itemExtent: 290.0,
         scrollDirection: ScrollDirection.horizontal,
         children: items.map((int item) {

packages/flutter/test/widget/scrollable_list_vertical_test.dart

@@ -9,7 +9,7 @@ import 'package:test/test.dart';
 const List<int> items = const <int>[0, 1, 2, 3, 4, 5];
 
 Widget buildFrame() {
-  return new ScrollableList2(
+  return new ScrollableList(
     itemExtent: 290.0,
     scrollDirection: ScrollDirection.vertical,
     children: items.map((int item) {

packages/flutter/test/widget/snap_scrolling_test.dart

@@ -29,7 +29,7 @@ Widget buildFrame() {
   return new Center(
     child: new Container(
       height: itemExtent * 2.0,
-      child: new ScrollableList2(
+      child: new ScrollableList(
         key: scrollableListKey,
         snapOffsetCallback: snapOffsetCallback,
         scrollDirection: scrollDirection,