[Offline pages] Creating BackgroundJobScheduler, which uses JobScheduler

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundJobScheduler.java

+// Copyright 2017 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.
+
+package org.chromium.chrome.browser.offlinepages;
+
+import android.annotation.TargetApi;
+import android.app.job.JobInfo;
+import android.app.job.JobScheduler;
+import android.content.ComponentName;
+import android.content.Context;
+import android.os.Build;
+import android.os.PersistableBundle;
+
+/**
+ * The background job scheduler class used for scheduling tasks using JobScheduler.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1)
+public class BackgroundJobScheduler extends BackgroundScheduler {
+    public static final int JOB_ID = 774322033;
+
+    public BackgroundJobScheduler(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void unschedule() {
+        // TODO(fgorski): Cancel the thing here.

[Pete Williamson, 2017/02/10 02:10:42]

We should implement cancel and overwrite before turning on the JobScheduler.

[fgorski, 2017/02/10 19:25:59]

Done. I changed the code enabling it to not do it yet.

+    }
+
+    @Override
+    protected void scheduleImpl(Context context, TriggerConditions triggerConditions,
+            long delayStartSeconds, long executionDeadlineSeconds, boolean overwrite) {
+        // TODO(fgorski): Handle overwrite case.
+
+        PersistableBundle taskExtras = new PersistableBundle();
+        TaskExtrasPacker.packTimeInBundle(taskExtras);
+        TaskExtrasPacker.packTriggerConditionsInBundle(taskExtras, triggerConditions);
+
+        JobInfo jobInfo =
+                new JobInfo
+                        .Builder(JOB_ID,
+                                new ComponentName(context, BackgroundSchedulerJobService.class))
+                        .setMinimumLatency(delayStartSeconds * 1000) // milliseconds
+                        .setOverrideDeadline(executionDeadlineSeconds * 1000) // milliseconds
+                        .setPersisted(true) // across device resets
+                        .setRequiredNetworkType(triggerConditions.requireUnmeteredNetwork()
+                                        ? JobInfo.NETWORK_TYPE_UNMETERED
+                                        : JobInfo.NETWORK_TYPE_ANY)
+                        .setRequiresCharging(triggerConditions.requirePowerConnected())
+                        .setExtras(taskExtras)
+                        .build();
+
+        ((JobScheduler) context.getSystemService(Context.JOB_SCHEDULER_SERVICE)).schedule(jobInfo);
+    }
+}