Test that client certificates do not break socket reuse.

This is further in preparation for revising this path. If we, for
instance, bifurcated the socket pools on client certificate decisions
without looking up from the cache eagerly, we'd regress this.

(There's no danger of that in the current plan, but it was something on
my mind so I wanted it captured in tests.)

Bug: 951205
Change-Id: Ie972337e6b72576c21df07aacf85a0e4cb9b928c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1590564
Commit-Queue: David Benjamin <[email protected]>
Reviewed-by: Matt Menke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#655433}
1 file changed