DO NOT MERGE - Run the task manager service at startup

Also moves most of it into android.app.task rather than android.content.

(Cherrypick from master)

Change-Id: Ic07a664bf54bc3e40aa0b892946edba4bf37262a
diff --git a/Android.mk b/Android.mk
index 9c41f9f..607f5fa 100644
--- a/Android.mk
+++ b/Android.mk
@@ -78,6 +78,7 @@
 	core/java/android/app/IServiceConnection.aidl \
 	core/java/android/app/IStopUserCallback.aidl \
 	core/java/android/app/task/ITaskCallback.aidl \
+	core/java/android/app/task/ITaskManager.aidl \
 	core/java/android/app/task/ITaskService.aidl \
 	core/java/android/app/IThumbnailRetriever.aidl \
 	core/java/android/app/ITransientNotification.aidl \