beccahughes@, is this a dup of bug 808379 ?

No this was to always show it filled in on the left hand side, regardless of what is cached.

Screenshot of pending CL attached

Deleted: Screenshot from 2018-04-03 15-02-44.png 167 KB

	Screenshot from 2018-04-03 15-02-44.png 167 KB View Download

I don't think it's a dup per say, but fixing this should also fix 808379

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fa0aceda11dedd026dc915be2b04654dbf9dba20

commit fa0aceda11dedd026dc915be2b04654dbf9dba20
Author: Becca Hughes <beccahughes@chromium.org>
Date: Wed Apr 04 16:53:58 2018

Media Controls: Do not show cached timeline segment

The modern media controls should not show what has been previously
cached on the left hand side of the play head. This pins the segment to
the zero position so it always is filled in.

BUG= 827539 

Change-Id: I97f5f06b7e349faf163667d2b19ef8930e0b13c7
Reviewed-on: https://chromium-review.googlesource.com/994180
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548099}
[modify] https://crrev.com/fa0aceda11dedd026dc915be2b04654dbf9dba20/third_party/WebKit/Source/modules/media_controls/elements/MediaControlTimelineElement.cpp