[Offline pages] Creating BackgroundJobScheduler, which uses JobScheduler

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

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundGcmScheduler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundGcmScheduler.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundGcmScheduler.java
new file mode 100644
index 0000000000000000000000000000000000000000..ae8126e3323ed72e9fd7cf3a75005c5db376de04
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/BackgroundGcmScheduler.java
@@ -0,0 +1,67 @@
+// 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.content.Context;
+import android.os.Bundle;
+
+import com.google.android.gms.common.ConnectionResult;
+import com.google.android.gms.common.GoogleApiAvailability;
+import com.google.android.gms.gcm.GcmNetworkManager;
+import com.google.android.gms.gcm.OneoffTask;
+import com.google.android.gms.gcm.Task;
+
+import org.chromium.chrome.browser.ChromeBackgroundService;
+
+/**
+ * The background scheduler class is for setting GCM Network Manager tasks.
+ */
+public class BackgroundGcmScheduler extends BackgroundScheduler {
+    public BackgroundGcmScheduler(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void cancel() {
+        GcmNetworkManager gcmNetworkManager = getGcmNetworkManager();
+        if (gcmNetworkManager == null) return;
+        gcmNetworkManager.cancelTask(OfflinePageUtils.TASK_TAG, ChromeBackgroundService.class);
+    }
+
+    @Override
+    protected void scheduleImpl(TriggerConditions triggerConditions, long delayStartSeconds,
+            long executionDeadlineSeconds, boolean overwrite) {
+        GcmNetworkManager gcmNetworkManager = getGcmNetworkManager();
+        if (gcmNetworkManager == null) return;
+
+        Bundle taskExtras = new Bundle();
+        TaskExtrasPacker.packTimeInBundle(taskExtras);
+        TaskExtrasPacker.packHoldWakelock(taskExtras);
+        TaskExtrasPacker.packTriggerConditionsInBundle(taskExtras, triggerConditions);
+
+        Task task = new OneoffTask.Builder()
+                            .setService(ChromeBackgroundService.class)
+                            .setExecutionWindow(delayStartSeconds, executionDeadlineSeconds)
+                            .setTag(OfflinePageUtils.TASK_TAG)
+                            .setUpdateCurrent(overwrite)
+                            .setRequiredNetwork(triggerConditions.requireUnmeteredNetwork()
+                                            ? Task.NETWORK_STATE_UNMETERED
+                                            : Task.NETWORK_STATE_CONNECTED)
+                            .setRequiresCharging(triggerConditions.requirePowerConnected())
+                            .setExtras(taskExtras)
+                            .build();
+
+        // Schedule a task using GCM network manager.
+        gcmNetworkManager.schedule(task);
+    }
+
+    private GcmNetworkManager getGcmNetworkManager() {
+        if (GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(getContext())
+                == ConnectionResult.SUCCESS) {
+            return GcmNetworkManager.getInstance(getContext());
+        }
+        return null;
+    }
+}