Changing to medium given need to read up and watch videos on this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f4d1cc682d5776d9c900a53e68c9db090f78588f

commit f4d1cc682d5776d9c900a53e68c9db090f78588f
Author: edchin <edchin@chromium.org>
Date: Thu Mar 15 07:19:17 2018

[ios] Dynamic type in tab grid

Dynamic type is now used in the:
- grid cell title
- toolbar text buttons
- empty state texts

The dynamic type used in the grid cell title
and the empty state text do not adhere to spec
because they are not semi-bolded.

Bug:  819667 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ie8ccccc68ec783ce6277c1cb57a26ba5895de8fd
Reviewed-on: https://chromium-review.googlesource.com/963180
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543323}
[modify] https://crrev.com/f4d1cc682d5776d9c900a53e68c9db090f78588f/ios/chrome/browser/ui/tab_grid/grid_cell.mm
[modify] https://crrev.com/f4d1cc682d5776d9c900a53e68c9db090f78588f/ios/chrome/browser/ui/tab_grid/tab_grid_bottom_toolbar.mm
[modify] https://crrev.com/f4d1cc682d5776d9c900a53e68c9db090f78588f/ios/chrome/browser/ui/tab_grid/tab_grid_top_toolbar.mm
[modify] https://crrev.com/f4d1cc682d5776d9c900a53e68c9db090f78588f/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

Finalizing the right preferred font styles will be considered part of polishing. If significant work is required to get custom fonts (i.e. semibold) that scale with dynamic type, then we can reopen this task or create a new one. Marking this done.

The NextAction date has arrived: 2018-03-28