Add a sky media service to make it possible to play a sound.

sky/sdk/example/widgets/piano.dart

Index: sky/sdk/example/widgets/piano.dart
diff --git a/sky/sdk/example/widgets/piano.dart b/sky/sdk/example/widgets/piano.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b8217b4bd8e3f778c565248658bb431f856c78db
--- /dev/null
+++ b/sky/sdk/example/widgets/piano.dart
@@ -0,0 +1,102 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:sky/mojo/net/fetch.dart';
+import 'package:mojom/media/media.mojom.dart';
+import 'package:mojom/mojo/url_response.mojom.dart';
+import 'package:sky/rendering/box.dart';
+import 'package:sky/rendering/flex.dart';
+import 'package:sky/theme/colors.dart' as colors;
+import 'package:sky/widgets/basic.dart';
+import 'package:sky/mojo/shell.dart' as shell;
+
+String soundUrl = "http://soundbible.com/grab.php?id=1931&type=wav";
+
+class Key {
+  Key(this.color);
+
+  Color color;
+  MediaPlayerProxy player;
+
+  void down() {
+    print('down ${player}');
+    if (player == null)
+      return;
+    player.ptr.seekTo(0);
+    player.ptr.start();
+  }
+
+  void up() {
+    print('up ${player}');
+    if (player == null)
+      return;
+    player.ptr.pause();
+  }
+}
+
+class PianoApp extends App {
+  final List<Map<int, Color> > pallets = [

[abarth-chromium, 2015/07/01 15:57:21]

s/> >/>>/

This ain't C++!

+    colors.Red,
+    colors.Orange,
+    colors.Yellow,
+    colors.Green,
+    colors.Blue,
+    colors.Purple,
+  ];
+
+  List<Key> keys = [];
+
+  PianoApp() {
+    for (var pallet in pallets) {
+      keys.add(new Key(pallet[500]));
+    }
+    loadSounds();
+  }
+
+  loadSounds() async {
+    MediaServiceProxy mediaService = new MediaServiceProxy.unbound();
+    shell.requestService("mojo:yo_mama", mediaService);

[abarth-chromium, 2015/07/01 15:57:21]

yo_mama!

+
+    for (Key key in keys) {
+      MediaPlayerProxy player = new MediaPlayerProxy.unbound();
+      mediaService.ptr.createPlayer(player);
+
+      UrlResponse response = await fetchUrl(soundUrl);
+      print(response);
+      await player.ptr.prepare(response.body);
+      print('PREPARED!');
+      key.player = player;
+    }
+    mediaService.close();
+    // Are we leaking all the player connections?
+    scheduleBuild();
+  }
+
+  Widget build() {
+    List<Widget> children = [];
+    for (Key key in keys) {
+      children.add(
+        new Listener(
+          child: new Flexible(
+            child: new Container(
+              decoration: new BoxDecoration(backgroundColor: key.color)
+            )
+          ),
+          onPointerCancel: (_) => key.up(),
+          onPointerDown: (_) => key.down(),
+          onPointerUp: (_) => key.up()
+        )
+      );
+    }
+
+    return new Flex(
+      children,
+      direction: FlexDirection.vertical
+    );
+  }
+}
+
+void main() {
+  runApp(new PianoApp());
+}