DevTools: Show timeline JS frames even if there no function call lays beneath.

BUG=363976

Review URL: https://codereview.chromium.org/591473002

git-svn-id: svn://svn.chromium.org/blink/trunk@182389 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r182359

http://src.chromium.org/viewvc/blink?view=revision&revision=182359

BUG=415719
TBR=wangxianzhu@chromium.org

Review URL: https://codereview.chromium.org/594463002

git-svn-id: svn://svn.chromium.org/blink/trunk@182390 bbb929c8-8fbe-4397-9dbb-9b2b20218538