Advertise HTTP/2 support.

Advertise HTTP/2 support.

Advertise "h2" token with ALPN and accept "h2" token in NPN.  This is the final,
almost-published version of HTTP/2.

Add "h2" to relevant tests.

Also add placeholder values (in comment) for drafts 16 and 17.  They might be
used for testing, or for collecting statistics about servers in the wild (not to
be released on Stable channel though).

BUG=401166
Committed: https://crrev.com/bfa20e6cbe5fcd30909b3e271005a527526385d9
Cr-Commit-Position: refs/heads/master@{#319767}

[Bence, 2015-03-09 19:11:24]

bnc@chromium.org changed reviewers:
+ rch@chromium.org

[Bence, 2015-03-09 19:11:25]

Ryan, PTAL.  Thanks.

[Ryan Hamilton, 2015-03-09 19:42:15]

lgtm

[Bence, 2015-03-09 21:02:37]

The CQ bit was checked by bnc@chromium.org

[Bence, 2015-03-09 21:03:05]

The CQ bit was unchecked by bnc@chromium.org

[Bence, 2015-03-09 21:06:14]

The CQ bit was checked by bnc@chromium.org

[commit-bot: I haz the power, 2015-03-09 21:06:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/987123002/1

[commit-bot: I haz the power, 2015-03-09 22:33:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-09 22:33:28]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Bence, 2015-03-09 23:12:52]

bnc@chromium.org changed reviewers:
+ ttuttle@chromium.org

[Bence, 2015-03-09 23:12:53]

ttuttle: PTAL at components/domain_reliability/util.cc.  Thank you.

[Deprecated (see juliatuttle), 2015-03-09 23:17:31]

On 2015/03/09 23:12:53, Bence wrote:
> ttuttle: PTAL at components/domain_reliability/util.cc.  Thank you.

components/domain_reliability/util.cc lgtm. (I may split it out into a separate
"HTTP2" case, or change the name for all of them, but this is fine for now.)

[Bence, 2015-03-09 23:18:54]

The CQ bit was checked by bnc@chromium.org

[commit-bot: I haz the power, 2015-03-09 23:19:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/987123002/1

[commit-bot: I haz the power, 2015-03-09 23:29:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-09 23:29:58]

Patchset 1 (id:??) landed as
https://crrev.com/bfa20e6cbe5fcd30909b3e271005a527526385d9
Cr-Commit-Position: refs/heads/master@{#319767}