[NTP Snippets] Schedule periodic fetching

chrome/android/java/src/org/chromium/chrome/browser/ChromeBackgroundService.java

-// Copyright 2015 The Chromium Authors. All rights reserved.
+// Copyright 2016 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;
 
 import android.content.Context;
 
 import com.google.android.gms.gcm.GcmNetworkManager;
 import com.google.android.gms.gcm.GcmTaskService;
 import com.google.android.gms.gcm.TaskParams;
 
 import org.chromium.base.Log;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.base.library_loader.LibraryProcessType;
 import org.chromium.base.library_loader.ProcessInitException;
+import org.chromium.chrome.browser.ntp.snippets.SnippetsController;
+import org.chromium.chrome.browser.ntp.snippets.SnippetsLauncher;
 import org.chromium.content.app.ContentApplication;
 import org.chromium.content.browser.BrowserStartupController;
 
 /**
- * {@link BackgroundSyncLauncherService} is scheduled through the {@link GcmNetworkManager}
- * when the browser needs to be launched in response to changing network or power conditions.
+ * {@link ChromeBackgroundService} is scheduled through the {@link GcmNetworkManager} when the
+ * browser needs to be launched for scheduled tasks, or in response to changing network or power
+ * conditions.
  */
-public class BackgroundSyncLauncherService extends GcmTaskService {
-    private static final String TAG = "BgSyncLauncher";
+public class ChromeBackgroundService extends GcmTaskService {
+    private static final String TAG = "BackgroundService";
 
     @Override
+    public int onRunTask(TaskParams params) {
+        Log.i(TAG, "Woken up at " + new java.util.Date().toString());
+        handleRunTask(params.getTag());
+        return GcmNetworkManager.RESULT_SUCCESS;
+    }
+
     @VisibleForTesting
-    public int onRunTask(TaskParams params) {
-        // Start the browser. The browser's BackgroundSyncManager (for the active profile) will
-        // start, check the network, and run any necessary sync events. This task runs with a wake
-        // lock, but has a three minute timeout, so we need to start the browser in its own task.
-        // TODO(jkarlin): Protect the browser sync event with a wake lock. See crbug.com/486020.
-        Log.v(TAG, "Starting Browser after coming online");
+    public void handleRunTask(final String tag) {
         final Context context = this;
         ThreadUtils.runOnUiThread(new Runnable() {
             @Override
             public void run() {
-                if (!BackgroundSyncLauncher.hasInstance()) {
-                    launchBrowser(context);
+                switch(tag) {
+                    case BackgroundSyncLauncher.TASK_TAG:
+                        handleBackgroundSyncEvent(context);
+                        break;
+
+                    case SnippetsLauncher.TASK_TAG:
+                        handleFetchSnippets(context);
+                        break;
+
+                    default:
+                        Log.i(TAG, "Unknown task tag " + tag);
+                        break;
                 }
             }
         });
-        return GcmNetworkManager.RESULT_SUCCESS;
+    }
+
+    private void handleBackgroundSyncEvent(Context context) {
+        if (!BackgroundSyncLauncher.hasInstance()) {
+            // Start the browser. The browser's BackgroundSyncManager (for the active profile) will
+            // start, check the network, and run any necessary sync events. This task runs with a
+            // wake lock, but has a three minute timeout, so we need to start the browser in its
+            // own task.
+            // TODO(jkarlin): Protect the browser sync event with a wake lock.
+            // See crbug.com/486020.
+            launchBrowser(context);
+        }
+    }
+
+    private void handleFetchSnippets(Context context) {
+        if (!SnippetsLauncher.hasInstance()) {
+            launchBrowser(context);
+        }
+        SnippetsController.get(context).fetchSnippets(true);
     }
 
     @VisibleForTesting
     @SuppressFBWarnings("DM_EXIT")
     protected void launchBrowser(Context context) {
+        Log.i(TAG, "Launching browser");
         ContentApplication.initCommandLine(context);
         try {
             BrowserStartupController.get(context, LibraryProcessType.PROCESS_BROWSER)
                     .startBrowserProcessesSync(false);
         } catch (ProcessInitException e) {
             Log.e(TAG, "ProcessInitException while starting the browser process");
             // Since the library failed to initialize nothing in the application
             // can work, so kill the whole application not just the activity.
             System.exit(-1);
         }
     }
 
     @Override
-    @VisibleForTesting
     public void onInitializeTasks() {
         BackgroundSyncLauncher.rescheduleTasksOnUpgrade(this);
     }
 }