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

sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java

Index: sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java
diff --git a/sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java b/sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java
index 26f8037257ce0d230c4f9e87b51c12e1a05d0ef0..4a6aa44ba9122e47c1fa19eef6ceb939fab9a88b 100644
--- a/sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java
+++ b/sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java
@@ -12,8 +12,10 @@ import org.chromium.mojo.system.Core;
 import org.chromium.mojo.system.MessagePipeHandle;
 import org.chromium.mojom.intents.ActivityManager;
 import org.chromium.mojom.keyboard.KeyboardService;
+import org.chromium.mojom.media.MediaService;
 import org.chromium.mojom.sensors.SensorService;
 import org.domokit.intents.ActivityManagerImpl;
+import org.domokit.media.MediaServiceImpl;
 import org.domokit.sky.shell.ServiceFactory;
 import org.domokit.sky.shell.ServiceRegistry;
 import org.domokit.sky.shell.SkyApplication;
@@ -46,5 +48,12 @@ public class SkyDemoApplication extends SkyApplication {
                 ActivityManager.MANAGER.bind(new ActivityManagerImpl(context), pipe);
             }
         });
+
+        ServiceRegistry.SHARED.register(MediaService.MANAGER.getName(), new ServiceFactory() {
+            @Override
+            public void connectToService(Context context, Core core, MessagePipeHandle pipe) {
+                MediaService.MANAGER.bind(new MediaServiceImpl(context, core), pipe);
+            }
+        });
     }
 }