Metric & meta-metric for CECPQ1 handshake latency.
To fairly measure the latency impact of CECPQ1, we need to measure only
hosts that will negotiate it. Define a small group of Google hosts that
we believe ought to be negotiating CECPQ1, and a new histogram that
measures latency when connecting to these hosts.
In addition, add a meta-metric that (in the experiment group only)
allows us to verify that CECPQ1 is being negotiated in cases where we
expect it to be. This will serve as a check on the quality of the first
metric.
BUG=626363
Review-Url: https://codereview.chromium.org/2192053002
Cr-Commit-Position: refs/heads/master@{#411518}
5 files changed
