net: perform a non-A DNS lookup for HTTPS hosts.

net: perform a non-A DNS lookup for HTTPS hosts.

Since SSLHostInfo is enabled by default now, this will cause a DNS
lookup for a random RR type (13172) for each HTTPS host. (Although many
of these lookups will hit the in-process cache. Also, this won't do
anything on non-Linux machines because I haven't gotten the DNS lookup
code working on them yet.)

At some point in the future we'll probably want to do these lookups in
order to get information for certificate validation. This change just
exists so that we can measure how long these lookups take.

BUG=none
TEST=none

[agl, 2011-01-06 17:36:45]

ping

[Mike Belshe, 2011-01-06 17:51:06]

http://codereview.chromium.org/6041004/diff/2001/net/socket/ssl_host_info.cc
File net/socket/ssl_host_info.cc (right):

http://codereview.chromium.org/6041004/diff/2001/net/socket/ssl_host_info.cc#...
net/socket/ssl_host_info.cc:227: HISTOGRAM_TIMES("Net.SSLHostInfoDNSLookup",
elapsed);
Do you want this to be UMA_HISTOGRAM_TIMES?  (I think so)

[agl, 2011-01-06 18:12:08]

PTAL

http://codereview.chromium.org/6041004/diff/2001/net/socket/ssl_host_info.cc
File net/socket/ssl_host_info.cc (right):

http://codereview.chromium.org/6041004/diff/2001/net/socket/ssl_host_info.cc#...
net/socket/ssl_host_info.cc:227: HISTOGRAM_TIMES("Net.SSLHostInfoDNSLookup",
elapsed);
On 2011/01/06 17:51:06, Mike Belshe wrote:
> Do you want this to be UMA_HISTOGRAM_TIMES?  (I think so)

Opps, yes, thanks.

[mbelshe, 2011-01-06 18:20:11]

Lgtm
On Jan 6, 2011 10:12 AM, <agl@chromium.org> wrote:
> PTAL
>
>
>
http://codereview.chromium.org/6041004/diff/2001/net/socket/ssl_host_info.cc
> File net/socket/ssl_host_info.cc (right):
>
>
http://codereview.chromium.org/6041004/diff/2001/net/socket/ssl_host_info.cc#...
> net/socket/ssl_host_info.cc:227:
> HISTOGRAM_TIMES("Net.SSLHostInfoDNSLookup", elapsed);
> On 2011/01/06 17:51:06, Mike Belshe wrote:
>> Do you want this to be UMA_HISTOGRAM_TIMES? (I think so)
>
> Opps, yes, thanks.
>
> http://codereview.chromium.org/6041004/