Chrome Version: 64.0.3282.116
OS: Android

What steps will reproduce the problem?
(1) Tap on tab switcher on the top-right corner
(2) Swipe up and down tabs
(3) Observe the back/home/switch tab toolbar in the bottom

What is the expected result?
the tool bar should be in transparent 

What happens instead?
the tool bar is in white

Please use labels and text to provide additional information.

Here are feedback reports:
https://listnr.corp.google.com/report/84975325317
https://listnr.corp.google.com/report/84978072957
https://listnr.corp.google.com/report/84972648700


I can reproduce it on my phone (https://screenshot.googleplex.com/Jqqy4wgj9Yn)
Version:
64.0.3282.116
Device Model:
Pixel XL
Device Release:
8.1.0




For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.