Fix is here https://chromium-review.googlesource.com/c/582069/

Hey Alex, I was hoping to get your advice on this. I've got a fix (which I didn't associate with this bug) listed above, but I was wondering if you'd prefer we merge back a revert of the CL that introduced the issue (https://chromium-review.googlesource.com/c/579870/). 

Both are small, and the fix has been reverted for the time being so we could quiclk go either way.

Am relanding fix, but removed the merge request while that's in progress.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c2485c414664902ebdc0b297b65ef52e0a6cc080

commit c2485c414664902ebdc0b297b65ef52e0a6cc080
Author: Ian Vollick <vollick@chromium.org>
Date: Sat Jul 22 01:37:03 2017

Reland "[vr] Restore opacity when transient elements are shown again."

This is a reland of c140538983d4575003bb31ee4f522da635e1a3c9
Original change's description:
> [vr] Restore opacity when transient elements are shown again.
> 
> We'd previously set opacity to 0.0 when hiding elements in the
> transience manager which makes it tricky to see them when they come
> back. With this change, we inform the manager of the desired "opacity
> when visible" and it will restore elements to that opacity when
> shown again.
> 
> Bug: None
> Change-Id: I1a941c3032c35adab5afed17a8afc60bd41230f5
> Reviewed-on: https://chromium-review.googlesource.com/582069
> Commit-Queue: Ian Vollick <vollick@chromium.org>
> Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#488788}

TBR=cjgrant@chromium.org

Bug:  747633 
Change-Id: I340ed94f61f016243dc4495d687cab1d58ea2e67
Reviewed-on: https://chromium-review.googlesource.com/582529
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488833}
[modify] https://crrev.com/c2485c414664902ebdc0b297b65ef52e0a6cc080/chrome/browser/vr/elements/simple_textured_element.h
[modify] https://crrev.com/c2485c414664902ebdc0b297b65ef52e0a6cc080/chrome/browser/vr/elements/transience_manager.cc
[modify] https://crrev.com/c2485c414664902ebdc0b297b65ef52e0a6cc080/chrome/browser/vr/elements/transience_manager.h
[modify] https://crrev.com/c2485c414664902ebdc0b297b65ef52e0a6cc080/chrome/browser/vr/elements/transience_manager_unittest.cc
[modify] https://crrev.com/c2485c414664902ebdc0b297b65ef52e0a6cc080/chrome/browser/vr/elements/transient_url_bar.cc

Your change meets the bar and is auto-approved for M61. Please go ahead and merge the CL to branch 3163 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), ketakid @(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5169107588c83be8adfb044e11bd0767a54a46b1

commit 5169107588c83be8adfb044e11bd0767a54a46b1
Author: Ian Vollick <vollick@chromium.org>
Date: Mon Jul 24 13:52:21 2017

Reland "[vr] Restore opacity when transient elements are shown again."

This is a reland of c140538983d4575003bb31ee4f522da635e1a3c9
Original change's description:
> [vr] Restore opacity when transient elements are shown again.
>
> We'd previously set opacity to 0.0 when hiding elements in the
> transience manager which makes it tricky to see them when they come
> back. With this change, we inform the manager of the desired "opacity
> when visible" and it will restore elements to that opacity when
> shown again.
>
> Bug: None
> Change-Id: I1a941c3032c35adab5afed17a8afc60bd41230f5
> Reviewed-on: https://chromium-review.googlesource.com/582069
> Commit-Queue: Ian Vollick <vollick@chromium.org>
> Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#488788}

TBR=cjgrant@chromium.org, vollick@chromium.org

(cherry picked from commit c2485c414664902ebdc0b297b65ef52e0a6cc080)

Bug:  747633 
Change-Id: I340ed94f61f016243dc4495d687cab1d58ea2e67
Reviewed-on: https://chromium-review.googlesource.com/582529
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#488833}
Reviewed-on: https://chromium-review.googlesource.com/582967
Cr-Commit-Position: refs/branch-heads/3163@{#9}
Cr-Branched-From: ff259bab28b35d242e10186cd63af7ed404fae0d-refs/heads/master@{#488528}
[modify] https://crrev.com/5169107588c83be8adfb044e11bd0767a54a46b1/chrome/browser/vr/elements/simple_textured_element.h
[modify] https://crrev.com/5169107588c83be8adfb044e11bd0767a54a46b1/chrome/browser/vr/elements/transience_manager.cc
[modify] https://crrev.com/5169107588c83be8adfb044e11bd0767a54a46b1/chrome/browser/vr/elements/transience_manager.h
[modify] https://crrev.com/5169107588c83be8adfb044e11bd0767a54a46b1/chrome/browser/vr/elements/transience_manager_unittest.cc
[modify] https://crrev.com/5169107588c83be8adfb044e11bd0767a54a46b1/chrome/browser/vr/elements/transient_url_bar.cc