Add download summary notification subtext

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
index bc4f784382424a0db1b21f5793fb9004d6b8a614..b6861f250a27545a21385716dc438bd40723ef03 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java
@@ -258,9 +258,6 @@ public class DownloadNotificationService extends Service {
      * @return        a {@link Notification} that represents the summary icon for all downloads.
      */
     private static Notification buildSummaryNotificationWithIcon(Context context, int iconId) {
-        String title =
-                context.getResources().getString(R.string.download_notification_summary_title);
-
         ChromeNotificationBuilder builder =
                 AppHooks.get()
                         .createChromeNotificationBuilder(true /* preferCompat */,
@@ -268,7 +265,9 @@ public class DownloadNotificationService extends Service {
                                 context.getString(R.string.notification_category_browser),
                                 NotificationConstants.CATEGORY_GROUP_ID_GENERAL,
                                 context.getString(R.string.notification_category_group_general))
-                        .setContentTitle(title)
+                        .setContentTitle(
+                                context.getString(R.string.download_notification_summary_title))
+                        .setSubText(context.getString(R.string.menu_downloads))

[David Trainor- moved to gerrit, 2017/03/15 22:24:01]

Working with team to figure out the string.  Sending this out for code review
for general code, will update string before I land if necessary.

                         .setSmallIcon(iconId)
                         .setLocalOnly(true)
                         .setGroup(NotificationConstants.GROUP_DOWNLOADS)