Allow specifying atrace buffer size with profile-chrome-startup.sh

We are now able to plumb atrace buffer sizes to catapult's startup
scripts as of:
https://chromium-review.googlesource.com/c/catapult/+/1412040

And this change continues that plumbing.

Bug: None
Change-Id: I594f544c1aa6ca8ee86a0670989f11462832a4cd
Reviewed-on: https://chromium-review.googlesource.com/c/1412621
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#623280}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e932f580a8f601a983cb7b9f922bcd5a04c0265b
1 file changed