The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cc724182d056a22d5b3869bcbb98828394f4af8d

commit cc724182d056a22d5b3869bcbb98828394f4af8d
Author: edchin <edchin@chromium.org>
Date: Thu Mar 08 17:15:06 2018

[ios] Grid empty states

This CL builds the basic logic and setup of the empty
states in the regular and incognito grids.

A future CL ( crbug.com/818198 ) will create a constants file
and consolidate/organize numbers as needed. This CL leaves
raw numbers in their place to minimize lookups while tweaking.

New raw strings will be internationalized through the process.

Bug:  804557 ,  804573 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I546e88e195e1273bc34c2f2e5d8c4c2f48930263
Reviewed-on: https://chromium-review.googlesource.com/954714
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541816}
[modify] https://crrev.com/cc724182d056a22d5b3869bcbb98828394f4af8d/ios/chrome/browser/ui/tab_grid/grid_view_controller.h
[modify] https://crrev.com/cc724182d056a22d5b3869bcbb98828394f4af8d/ios/chrome/browser/ui/tab_grid/grid_view_controller.mm
[modify] https://crrev.com/cc724182d056a22d5b3869bcbb98828394f4af8d/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

The NextAction date has arrived: 2018-03-14

Re-opening this because it should not have closed without:
1) Slightly different configuration/alignment for regular width size class
2) Eg tests
Working on these now, and should still be able to finish before end of Q1. 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/40a0872496ba62708bf57844114fb7222ee61183

commit 40a0872496ba62708bf57844114fb7222ee61183
Author: edchin <edchin@chromium.org>
Date: Mon Mar 19 18:41:10 2018

[ios] Extract empty state from TabGridViewController

This CL pulls a non-trivial amount of code out of TabGridViewController
and encapsulates it in a separate UIView subclass.
This CL also changes the layout based on orientation for the empty
state.

Bug:  804557 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ic1f03445b014a331bdf383e999b522fcbe1b3143
Reviewed-on: https://chromium-review.googlesource.com/967731
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544078}
[modify] https://crrev.com/40a0872496ba62708bf57844114fb7222ee61183/ios/chrome/browser/ui/tab_grid/BUILD.gn
[modify] https://crrev.com/40a0872496ba62708bf57844114fb7222ee61183/ios/chrome/browser/ui/tab_grid/tab_grid_constants.h
[modify] https://crrev.com/40a0872496ba62708bf57844114fb7222ee61183/ios/chrome/browser/ui/tab_grid/tab_grid_constants.mm
[add] https://crrev.com/40a0872496ba62708bf57844114fb7222ee61183/ios/chrome/browser/ui/tab_grid/tab_grid_empty_state_view.h
[add] https://crrev.com/40a0872496ba62708bf57844114fb7222ee61183/ios/chrome/browser/ui/tab_grid/tab_grid_empty_state_view.mm
[modify] https://crrev.com/40a0872496ba62708bf57844114fb7222ee61183/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

Remaining CL to close this is an egtest update. This CL is in-flight. 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/441a33587a52881e58817018d35f9053de062b9e

commit 441a33587a52881e58817018d35f9053de062b9e
Author: edchin <edchin@chromium.org>
Date: Wed Mar 21 08:12:24 2018

[ios] Egtests for regular grid empty state

Bug:  804557 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I78bd8b762afa23c27101afba9d37da85958dd582
Reviewed-on: https://chromium-review.googlesource.com/972189
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@{#544654}
[modify] https://crrev.com/441a33587a52881e58817018d35f9053de062b9e/ios/chrome/browser/ui/tab_grid/tab_grid_constants.h
[modify] https://crrev.com/441a33587a52881e58817018d35f9053de062b9e/ios/chrome/browser/ui/tab_grid/tab_grid_constants.mm
[modify] https://crrev.com/441a33587a52881e58817018d35f9053de062b9e/ios/chrome/browser/ui/tab_grid/tab_grid_egtest.mm
[modify] https://crrev.com/441a33587a52881e58817018d35f9053de062b9e/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.h
[modify] https://crrev.com/441a33587a52881e58817018d35f9053de062b9e/ios/chrome/browser/ui/tab_grid/tab_grid_view_controller.mm

The NextAction date has arrived: 2018-03-28