This seems like it needs to be part of the larger snowflake effort to unify toasts / snackbars. Will add an initial solution as a part of my design proposal for UI Review next week. 

Let's remove the toast instead. 

Remove what toast?  Are you saying we should remove the undo tab closed snackbar?

That seems kind of risky to me as that is the one option you have to quickly undo a potential mistake you made.  Removing this would likely be quite unpopular if I would guess.

My thinking was that the user can always get it back via Recents or omnibox suggestions. Looks like <1% of these toasts are used and though 2.7% of users use it, I'm wondering if folks think thats enough to warrant showing a toast every time the other 97.3% close a tab.

We had a brief discussion about it in the bug bash spreadsheet:

https://docs.google.com/a/google.com/spreadsheets/d/1entEbcJTeKn4iBIvusa_TqEVzISLsaSGv-P3rJhaKNM/edit?disco=AAAABN6bv6M

Because this is such a low priority (and something that will eventually be addressed when we unify snackbar/toasts etc. vis snowflake), I'm happy to hold on this for now :)

Because this is a feature we don't have in Bling, have we gotten any user feedback requesting something like this?

I feel this is one of those things that is used very rarely, but would be sorely missed when you need it.  Especially for those that accidentally close all of their tabs by mistake.

@Hannah, did you think this should be moved up to M63?

Yep! Added a comment in the tracker as well. Thanks!

I think I'm still in favor of punting this to post-M63 to phase out the changes that break flows but I'm open to other thoughts. Why do you think it should moved up to M63?

Summary from our meeting with Alex: Attached specs where we changed just the font colors, and background color to white (with added dropshadow)for Chrome Home for just the download confirmation, and undo closed tab. This is a priority from the UX side but please provide some guidance on the feasibility for an update like this for M62-3+.

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Sounds good to me. Renaming the bug to capture that and bumping priority to M63 but feel free to push back if harder.

Is this a styling change for all snackbars (relatively easy) or just the two snackbars mentioned in #11 (harder, but possibly still feasible for M63)?

I believe it was all snackbars but can you confirm Hannah?

Becky, will you look into updating our snackbars for modern?

Just want to make sure: is this a conditional change with Chrome Home or not?

If unconditional, how does the shadow work tablet version? the tablet snackbar has a shorter width.

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It should be conditional to Chrome Home

Screenshot of changes. Please check!

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/19bc748359e41fdbd00798fd7706ffdbd0cf5c2b

commit 19bc748359e41fdbd00798fd7706ffdbd0cf5c2b
Author: Becky Zhou <huayinz@chromium.org>
Date: Thu Sep 07 19:01:10 2017

[Chrome Home] Snackbar visual refresh

With Chrome Home enabled:
+ Change background to white
+ Change message to black 87 and button to blue 500
+ Add shadow

Bug:  731321 
Change-Id: I98b98daf26ed8b15dc548b13d366269bec5e8f42
Reviewed-on: https://chromium-review.googlesource.com/653485
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#500351}
[modify] https://crrev.com/19bc748359e41fdbd00798fd7706ffdbd0cf5c2b/chrome/android/java/res/layout/snackbar.xml
[modify] https://crrev.com/19bc748359e41fdbd00798fd7706ffdbd0cf5c2b/chrome/android/java/res/values/dimens.xml
[modify] https://crrev.com/19bc748359e41fdbd00798fd7706ffdbd0cf5c2b/chrome/android/java/src/org/chromium/chrome/browser/snackbar/SnackbarView.java

Closing this out. Hannah/Chris, please re-open if there are any issues with the screenshot Becky provided in #20.