[NTP Snippets] Schedule periodic fetching

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

-// Copyright 2015 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.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.
- */
-public class BackgroundSyncLauncherService extends GcmTaskService {
-    private static final String TAG = "BgSyncLauncher";
-
-    @Override
-    @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");
-        final Context context = this;
-        ThreadUtils.runOnUiThread(new Runnable() {
-            @Override
-            public void run() {
-                if (!BackgroundSyncLauncher.hasInstance()) {
-                    launchBrowser(context);
-                }
-            }
-        });
-        return GcmNetworkManager.RESULT_SUCCESS;
-    }
-
-    @VisibleForTesting
-    @SuppressFBWarnings("DM_EXIT")
-    protected void launchBrowser(Context context) {
-        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);
-    }
-}