Add an automatic storage management job service.

This service runs once a day when plugged in when the device has
under 15% free space remaining. If the FeatureFactory has a
storage management job, it runs the job to begin to free up space
on the device.

This is a temporary landing place and will be refactored very
quickly out of Settings.

Bug: 28600825

Change-Id: Id2ebb42a333b3b4e3daef4e50cf985fe055b85c7

src/com/android/settings/overlay/StorageManagementJobProvider.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.overlay;
+
+import android.app.job.JobParameters;
+import android.content.Context;
+
+/**
+ * Feature provider for automatic storage management jobs.
+ */
+public interface StorageManagementJobProvider {
+    /**
+     * Starts an asynchronous deletion job to clear out storage older than
+     * @param params Standard JobService parameters.
+     * @param daysToRetain Number of days of information to retain on the device.
+     * @return If the job needs to process the work on a separate thread.
+     */
+    boolean onStartJob(Context context, JobParameters params, int daysToRetain);
+
+    /**
+     * Attempt to stop the execution of the job.
+     * @param params Parameters specifying info about this job.
+     * @return If the job should be rescheduled.
+     */
+    boolean onStopJob(Context context, JobParameters params);
+}