The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/db28cd76143af87ec2e2d3878548926885637827

commit db28cd76143af87ec2e2d3878548926885637827
Author: sczs <sczs@chromium.org>
Date: Thu Mar 15 19:32:29 2018

[ios] Adds subtitle timestamp to Recent Tabs session headers.

- Adds a subtitle label to table_view_text_header_footer_item
- Sets this label as a timpestamp for RecentTabs sessions headers.

Screenshot:
https://drive.google.com/open?id=1yamLSxBoFXm0la14ZLVxsEqMMcbFu6BC

Bug:  805698 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2318b02df397d603285034a642fd75c7efb20953
Reviewed-on: https://chromium-review.googlesource.com/963674
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543472}
[modify] https://crrev.com/db28cd76143af87ec2e2d3878548926885637827/ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_table_view_controller.mm
[modify] https://crrev.com/db28cd76143af87ec2e2d3878548926885637827/ios/chrome/browser/ui/table_view/cells/table_view_text_header_footer_item.h
[modify] https://crrev.com/db28cd76143af87ec2e2d3878548926885637827/ios/chrome/browser/ui/table_view/cells/table_view_text_header_footer_item.mm

The NextAction date has arrived: 2018-03-28