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Last instrumentations showed that:
SSL_do_handshake call is 17 jph (I mean janks per startup-hour)
This excludes all callbacks that SSL_do_handshake can invoke.

SSLClientSocketOpenSSL::UpdateServerCert is 5.8 jph.

Adding instrumentations to differentiate the cert from no-cert cases.
Also instrumenting SSLClientSocketOpenSSL::UpdateServerCert.

BUG=424386

Review URL: https://codereview.chromium.org/787913003

Cr-Commit-Position: refs/heads/master@{#309590}