(repros on today's canary on mac; also repros on m67 stable)

What steps will reproduce the problem?
1. Go to https://bugs.chromium.org/p/chromium/issues/detail?id=832547
2. Scroll down

What is the expected result?

Media controls paint below the page header (the thing attached at the top saying "Regression:Background page gets scroll up after auto-scrolling inside the pdf file.")


What happens instead of that?

Media controls paint on top of it. Also see screenshot.


 

Deleted: Screen Shot 2018-06-09 at 6.17.20 PM.png 1.3 MB

	Screen Shot 2018-06-09 at 6.17.20 PM.png 1.3 MB View Download