Mark inspector/timeline/timeline-auto-record.html as flaky

This patch marks inspector/timeline/timeline-auto-record.html as flaky
on all platforms. See the bug for more information.


NOTRY=true
TBR=pfeldman
BUG=344238

Review URL: https://codereview.chromium.org/169113003

git-svn-id: svn://svn.chromium.org/blink/trunk@167252 bbb929c8-8fbe-4397-9dbb-9b2b20218538