Introduce new SPDY Version UMA histogram.
commitf1c950543990d7048e2323c106a11350fe95ab15
authorbnc <bnc@chromium.org>
Tue, 16 Sep 2014 13:30:57 +0000 (16 06:30 -0700)
committerCommit bot <commit-bot@chromium.org>
Tue, 16 Sep 2014 13:31:53 +0000 (16 13:31 +0000)
tree1ef47ab327e816a2774bd6baa526d3d9764cabe5
parent5fce5ef7bf7739c3751122e98f9c23f9bb2ad1a4
Introduce new SPDY Version UMA histogram.

The Net.SpdyVersion UMA histogram directly tracks internal NextProto enum
values, which change, for example, when protocols are deprecated, e.g.,
https://chromium.googlesource.com/chromium/src/+/13621d68bc4096987471ec698468a972af2fa1de%5E%21/#F9.

This CL obsoletes Net.SpdyVersion, and introduces Net.SpdyVersion2, which
uses values that are specifically generated for this purpuse, with the intent
that later versions will not change or reuse them.

BUG=412495

Review URL: https://codereview.chromium.org/560573002

Cr-Commit-Position: refs/heads/master@{#295053}
net/socket/next_proto.h
net/spdy/spdy_session.cc
net/spdy/spdy_test_util_common.cc
tools/metrics/histograms/histograms.xml