Test performance of Firefox with Page Shot on Talos

[ianb]

There's a possibility that simply having Page Shot installed will affect the performance of Firefox. As soon as #2313 lands we should see if this is the case using Talos.

[Standard8]

I discovered today that this is how you do it:

• Push a patch to try with Talos runs
• Either compare it against central, or another try push, via

https://treeherder.mozilla.org/perf.html#/comparechooser

I'll update the build patches, then get these pushed.

[Standard8]

Try pushes:

• Original: https://treeherder.mozilla.org/#/jobs?repo=try&revision=3a8b5d7fda75c301af5d2f579fc4bbe4b4196203
• With extension: https://treeherder.mozilla.org/#/jobs?repo=try&revision=cdab514f2f8c81c1651db2f2bd27d0549f45adfd
  (I exported a3279e2)

Compare link (won't work properly until try runs are complete):

https://treeherder.mozilla.org/perf.html#/compare?originalProject=try&originalRevision=3a8b5d7fda75c301af5d2f579fc4bbe4b4196203&newProject=try&newRevision=cdab514f2f8c81c1651db2f2bd27d0549f45adfd&framework=1&showOnlyImportant=0

[Standard8]

From what I can tell, the Talos run doesn't show anything we need to worry about, but I've sent an email to jmaher to get extra confidence.

[jaredhirsch]

For reference, here's the (Mozilla staff-only) link to the Talos conversation on the screenshots-staff list: https://groups.google.com/a/mozilla.com/d/topic/screenshots-staff/MBCS3GkepII/discussion

[Standard8]

Everything looks good - the Win64 tests showed OK as well. So I think we can close this now.