Add histogram to measure failure reasons for SSL Search

Add histogram to measure failure reasons for SSL Search

This change adds a histogram that measures the reasons why loads of
https://www.google.com fail in the hopes of getting some visibility into the
recent SSL search launch.

Since the users were navigating to a Google property in any case, and we would
have a log of that, this doesn't have any additional privacy impact.

BUG=none
TEST=none


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=112569

[jar (doing other things), 2011-11-17 20:24:59]

There is a notable data footprint for this histogram... so we should be wary to
remove it when it is not needed (but we have an adjacent histogram with the
non-google sites).

LGTM

Hopefully it will be rare that this histogram gets populated (lazy allocated).

[agl, 2011-12-01 21:17:40]

(throwing to Avi for OWNERs LGTM.)

[Avi (use Gerrit), 2011-12-01 21:53:36]

owner rubberstamp lgtm

[commit-bot: I haz the power, 2011-12-01 22:00:03]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/agl@chromium.org/8585038/1

[commit-bot: I haz the power, 2011-12-01 23:17:06]

Change committed as 112569