Unflake inspector/tracing/console-timeline.html

Make sure Timeline recording is started before console evaluation.

BUG=412782
R=loislo@chromium.org

Review URL: https://codereview.chromium.org/599843002

git-svn-id: svn://svn.chromium.org/blink/trunk@182566 bbb929c8-8fbe-4397-9dbb-9b2b20218538