Android notifications: set group for push notifications

chrome/android/java/src/org/chromium/chrome/browser/notifications/StandardNotificationBuilder.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.notifications;
 
 import android.app.Notification;
 import android.content.Context;
 import android.os.Build;
 
@@ skipping 38 matching lines @@
         for (Action action : mActions) {
             addActionToBuilder(builder, action);
         }
         if (mSettingsAction != null) {
             addActionToBuilder(builder, mSettingsAction);
         }
         builder.setDefaults(mDefaults);
         builder.setVibrate(mVibratePattern);
         builder.setWhen(mTimestamp);
         builder.setOnlyAlertOnce(!mRenotify);
+        setGroupOnBuilder(builder, mOrigin);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             // Notification.Builder.setPublicVersion was added in Android L.
             builder.setPublicVersion(createPublicNotification(mContext));
         }
         return builder.build();
     }
 }