REGRESSION:Timeline Distortion Observed in "Flame Chart" Section of Profiles in Dev-Tools

BUG=329510
R=vsevik@chromium.org

Review URL: https://codereview.chromium.org/100483008

git-svn-id: svn://svn.chromium.org/blink/trunk@164148 bbb929c8-8fbe-4397-9dbb-9b2b20218538