Implement the Notification `timestamp` property

chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationUIManager.java

 // Copyright 2014 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.notifications;
 
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
@@ skipping 379 matching lines @@
      * @param tag A string identifier for this notification. If the tag is not empty, the new
      *            notification will replace the previous notification with the same tag and origin,
      *            if present. If no matching previous notification is present, the new one will just
      *            be added.
      * @param title Title to be displayed in the notification.
      * @param body Message to be displayed in the notification. Will be trimmed to one line of
      *             text by the Android notification system.
      * @param icon Icon to be displayed in the notification. Valid Bitmap icons will be scaled to
      *             the platforms, whereas a default icon will be generated for invalid Bitmaps.
      * @param vibrationPattern Vibration pattern following the Web Vibration syntax.
+     * @param timestamp The timestamp of the event for which the notification is being shown.
      * @param silent Whether the default sound, vibration and lights should be suppressed.
      * @param actionTitles Titles of actions to display alongside the notification.
      * @see https://developer.android.com/reference/android/app/Notification.html
      */
     @CalledByNative
     private void displayNotification(long persistentNotificationId, String origin, String tag,
-            String title, String body, Bitmap icon, int[] vibrationPattern, boolean silent,
-            String[] actionTitles) {
+            String title, String body, Bitmap icon, int[] vibrationPattern, long timestamp,
+            boolean silent, String[] actionTitles) {
         Resources res = mAppContext.getResources();
 
         // Set up a pending intent for going to the settings screen for |origin|.
         Intent settingsIntent = PreferencesLauncher.createIntentForSettingsPage(
                 mAppContext, SingleWebsitePreferences.class.getName());
         settingsIntent.setData(makeIntentData(persistentNotificationId, origin,
                                               -1 /* actionIndex */));
         settingsIntent.putExtra(Preferences.EXTRA_SHOW_FRAGMENT_ARGUMENTS,
                 SingleWebsitePreferences.createFragmentArgsForSite(origin));
 
         PendingIntent pendingSettingsIntent = PendingIntent.getActivity(mAppContext,
                 PENDING_INTENT_REQUEST_CODE, settingsIntent, PendingIntent.FLAG_UPDATE_CURRENT);
 
         NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(mAppContext)
                 .setContentTitle(title)
                 .setContentText(body)
                 .setStyle(new NotificationCompat.BigTextStyle().bigText(body))
                 .setLargeIcon(ensureNormalizedIcon(icon, origin))
                 .setSmallIcon(R.drawable.ic_chrome)
                 .setContentIntent(makePendingIntent(
                         NotificationConstants.ACTION_CLICK_NOTIFICATION,
                         persistentNotificationId, origin, tag, -1 /* actionIndex */))
                 .setDeleteIntent(makePendingIntent(
                         NotificationConstants.ACTION_CLOSE_NOTIFICATION,
                         persistentNotificationId, origin, tag, -1 /* actionIndex */))
                 .setTicker(createTickerText(title, body))
+                .setWhen(timestamp)
                 .setSubText(origin);
 
         for (int actionIndex = 0; actionIndex < actionTitles.length; actionIndex++) {
             notificationBuilder.addAction(
                     0 /* actionIcon */, actionTitles[actionIndex],
                     makePendingIntent(NotificationConstants.ACTION_CLICK_NOTIFICATION,
                                       persistentNotificationId, origin, tag, actionIndex));
         }
         // Site settings button is always the last action button.
         notificationBuilder.addAction(R.drawable.settings_cog,
@@ skipping 121 matching lines @@
                                           origin, tag);
     }
 
     private static native void nativeInitializeNotificationUIManager();
 
     private native boolean nativeOnNotificationClicked(long nativeNotificationUIManagerAndroid,
             long persistentNotificationId, String origin, String tag, int actionIndex);
     private native boolean nativeOnNotificationClosed(long nativeNotificationUIManagerAndroid,
             long persistentNotificationId, String origin, String tag);
 }