The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/885d70868b4df78489e5b029ac6ddddd55882f26

commit 885d70868b4df78489e5b029ac6ddddd55882f26
Author: Mark Cogan <marq@google.com>
Date: Thu Mar 01 21:17:02 2018

[iOS] Wire up "done" control in TabGrid toolbar.

This CL adds a "tab presentation delegate" to the tab grid view
controller, and has the coordinator implement that delegate protocol.

For now, the path to actually trigger the presentation of the active
tab goes through the tab switcher delegate (that is, MainController).
Once there are fewer tab switchers to support, that can be cleaned up.

Bug:  804534 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I6d32e6c8145fe361ed4d6de51ced3d1178737a3d
Reviewed-on: https://chromium-review.googlesource.com/942344
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540286}
[modify] https://crrev.com/885d70868b4df78489e5b029ac6ddddd55882f26/ios/chrome/browser/ui/tab_grid/tab_grid_coordinator.mm
[modify] https://crrev.com/885d70868b4df78489e5b029ac6ddddd55882f26/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.h
[modify] https://crrev.com/885d70868b4df78489e5b029ac6ddddd55882f26/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

The NextAction date has arrived: 2018-03-14