Bump Dart SDK to 1.22.0-dev.10.3 (#7791)

bin/internal/dart-sdk.version

-1.22.0-dev.9.1
+1.22.0-dev.10.3

examples/stocks/lib/stock_data.dart

@@ -76,7 +76,7 @@ class StockDataFetcher {
       String json = response.body;
       if (json == null) {
         print("Failed to load stock data chunk ${_nextChunk - 1}");
-        return;
+        return null;
       }
       JsonDecoder decoder = new JsonDecoder();
       callback(new StockData(decoder.convert(json)));

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

@@ -517,7 +517,7 @@ class _DropdownButtonState<T> extends State<DropdownButton<T>> {
       style: _textStyle,
     )).then<Null>((_DropdownRouteResult<T> newValue) {
       if (!mounted || newValue == null)
-        return;
+        return null;
       if (config.onChanged != null)
         config.onChanged(newValue.result);
     });

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

@@ -537,7 +537,7 @@ class _PopupMenuButtonState<T> extends State<PopupMenuButton<T>> {
     )
     .then<Null>((T newValue) {
       if (!mounted || newValue == null)
-        return;
+        return null;
       if (config.onSelected != null)
         config.onSelected(newValue);
     });

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

@@ -317,14 +317,14 @@ abstract class PageableState<T extends Pageable> extends ScrollableState<T> {
     final double newScrollOffset = snapScrollOffset(scrollOffset + scrollVelocity.sign)
       .clamp(snapScrollOffset(scrollOffset - 0.5), snapScrollOffset(scrollOffset + 0.5));
     return scrollTo(newScrollOffset, duration: config.duration, curve: config.curve)
-      .then(_notifyPageChanged);
+      .then<Null>(_notifyPageChanged);
   }
 
   @override
   Future<Null> fling(double scrollVelocity) {
     switch(config.itemsSnapAlignment) {
       case PageableListFlingBehavior.canFlingAcrossMultiplePages:
-        return super.fling(scrollVelocity).then(_notifyPageChanged);
+        return (super.fling(scrollVelocity)).then<Null>(_notifyPageChanged);
       case PageableListFlingBehavior.stopAtNextPage:
         return _flingToAdjacentItem(scrollVelocity);
     }
@@ -335,7 +335,7 @@ abstract class PageableState<T extends Pageable> extends ScrollableState<T> {
   @override
   Future<Null> settleScrollOffset() {
     return scrollTo(snapScrollOffset(scrollOffset), duration: config.duration, curve: config.curve)
-      .then(_notifyPageChanged);
+      .then<Null>(_notifyPageChanged);
   }
 
   void _notifyPageChanged(Null value) {

packages/flutter_test/lib/src/controller.dart

@@ -143,7 +143,7 @@ class WidgetController {
   ///
   /// * Use [firstState] if you expect to match several states but only want the first.
   /// * Use [stateList] if you expect to match several states and want all of them.
-  T state<T extends State>(Finder finder) {
+  T state<T extends State<StatefulWidget>>(Finder finder) { // TODO(leafp): remove '<StatefulWidget>' when https://github.com/dart-lang/sdk/issues/28580 is fixed
     TestAsyncUtils.guardSync();
     return _stateOf<T>(finder.evaluate().single, finder);
   }
@@ -155,7 +155,7 @@ class WidgetController {
   /// matching widget has no state.
   ///
   /// * Use [state] if you only expect to match one state.
-  T firstState<T extends State>(Finder finder) {
+  T firstState<T extends State<StatefulWidget>>(Finder finder) { // TODO(leafp): remove '<StatefulWidget>' when https://github.com/dart-lang/sdk/issues/28580 is fixed
     TestAsyncUtils.guardSync();
     return _stateOf<T>(finder.evaluate().first, finder);
   }
@@ -167,12 +167,12 @@ class WidgetController {
   ///
   /// * Use [state] if you only expect to match one state.
   /// * Use [firstState] if you expect to match several but only want the first.
-  Iterable<T> stateList<T extends State>(Finder finder) {
+  Iterable<T> stateList<T extends State<StatefulWidget>>(Finder finder) { // TODO(leafp): remove '<StatefulWidget>' when https://github.com/dart-lang/sdk/issues/28580 is fixed
     TestAsyncUtils.guardSync();
     return finder.evaluate().map((Element element) => _stateOf<T>(element, finder));
   }
 
-  T _stateOf<T extends State>(Element element, Finder finder) {
+  T _stateOf<T extends State<StatefulWidget>>(Element element, Finder finder) { // TODO(leafp): remove '<StatefulWidget>' when https://github.com/dart-lang/sdk/issues/28580 is fixed
     TestAsyncUtils.guardSync();
     if (element is StatefulElement)
       return element.state;

packages/flutter_test/lib/src/test_async_utils.dart

@@ -102,8 +102,10 @@ class TestAsyncUtils {
         throw new FlutterError(message.toString().trimRight());
       }
     }
-    return result.then(
-      (Null value) => completionHandler(null, null),
+    return result.then<Null>(
+      (Null value) {
+        completionHandler(null, null);
+      },
       onError: completionHandler
     );
   }

packages/flutter_tools/lib/src/commands/daemon.dart

@@ -464,7 +464,7 @@ class AppDomain extends Domain {
     if (app == null)
       throw "app '$appId' not found";
 
-    return app.stop().timeout(new Duration(seconds: 5)).then((_) {
+    return app.stop().timeout(new Duration(seconds: 5)).then<bool>((_) {
       return true;
     }).catchError((dynamic error) {
       _sendAppEvent(app, 'log', <String, dynamic>{ 'log': '$error', 'error': true });

packages/flutter_tools/lib/src/ios/devices.dart

@@ -278,7 +278,7 @@ class IOSDevice extends Device {
 
       Future<int> launch = runCommandAndStreamOutput(launchCommand, trace: true);
 
-      List<Uri> uris = await launch.then((int result) async {
+      List<Uri> uris = await launch.then<List<Uri>>((int result) async {
         installationResult = result;
 
         if (result != 0) {