Change event parsing and icons for the sidebar.
Change event parsing and icons for the sidebar.

I got some complaints that the "play" arrow looked too much like the
normal devtools "expand this object" arrow, so i've replaced it and the
pause icon with matching ones from the bigger icon set that don't have
this problem.

Bug: 1200512
Change-Id: Ic829c6a8ae52777385b64168e479b70144d3c3b9
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2822960
Commit-Queue: Ted Meyer <49f16de1701e9d27e09eb331529eeca82ecbab45@chromium.org>
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend