From an engineering perspective, this is very easily accomplished. 
But this seems very odd from a iOS platform perspective. I don't think I've seen any iOS app that extends a text button's tap target so far away from the text of the button, especially one that does so asymmetrically. 

I agree it might be weird but the current setup is not ideal either.
Could we perhaps try extending it a bit and see how it feels?

I'm happy to give it a try. I am assigning this to me.

Pri-0 bugs are critical regressions or serious emergencies, and this bug has not been updated in three days. Could you please provide an update, or adjust the priority to a more appropriate level if applicable?

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This doesn't seem as important as other bugs; dropping to P2 unless you object

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7a6346e3f1912afb92d8a35a7977eaaa9386e770

commit 7a6346e3f1912afb92d8a35a7977eaaa9386e770
Author: edchin <edchin@chromium.org>
Date: Mon Jun 25 23:17:04 2018

[ios] Extend done button in tab grid

The done button tap target should be expanded so that the user can tap
the same spot when entering and exiting the tab grid.

This CL also fixes the ellipsis when changing the "Close All" button text to "Undo".

Bug:  825787 ,  849193 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I352e9654419c670f6dea431003a9c189ed639156
Reviewed-on: https://chromium-review.googlesource.com/1114149
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570228}
[modify] https://crrev.com/7a6346e3f1912afb92d8a35a7977eaaa9386e770/ios/chrome/browser/ui/tab_grid/BUILD.gn
[modify] https://crrev.com/7a6346e3f1912afb92d8a35a7977eaaa9386e770/ios/chrome/browser/ui/tab_grid/tab_grid_bottom_toolbar.mm
[modify] https://crrev.com/7a6346e3f1912afb92d8a35a7977eaaa9386e770/ios/chrome/browser/ui/tab_grid/tab_grid_top_toolbar.mm