Also instrument memcache path.
Also instrument memcache path.

Extends https://codereview.chromium.org/1007323006/.

BUG=469911

Review URL: https://codereview.chromium.org/1029253003

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra