Add "UNKNOWN_TILE_TYPE" for metrics

Add "UNKNOWN_TILE_TYPE" for metrics

iOS doesn't yet have any delegate method that fires when we have
finished loading all the tiles on the NTP. Without that, it's not
possible to reliably output metrics for tile types. Adding this (after
NUM_RECORDED_TILE_TYPES) will let us proceed with the conversion to
metrics::RecordPageImpression() in the meantime.

BUG=669090
Committed: https://crrev.com/208aa90371f4c7f51ac7745125a076cef6861b75
Cr-Commit-Position: refs/heads/master@{#434985}

[sfiera, 2016-11-28 17:21:42]

The CQ bit was checked by sfiera@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-28 17:22:08]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[sfiera, 2016-11-28 17:26:25]

sfiera@chromium.org changed reviewers:
+ treib@chromium.org

[commit-bot: I haz the power, 2016-11-28 19:46:42]

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

[commit-bot: I haz the power, 2016-11-28 19:46:43]

Dry run: This issue passed the CQ dry run.

[Marc Treib, 2016-11-29 14:13:26]

lgtm

[sfiera, 2016-11-29 14:37:57]

The CQ bit was checked by sfiera@chromium.org

[commit-bot: I haz the power, 2016-11-29 14:38:14]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-29 14:42:40]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480430277436510, "parent_rev":
"9ccf2fa07308ec09d864157d028cb54bc7e9e595", "commit_rev":
"5fbc14493982ba5db5555d3868677f20ee9dc8ff"}

[commit-bot: I haz the power, 2016-11-29 14:43:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-29 14:45:25]

Description was changed from

==========
Add "UNKNOWN_TILE_TYPE" for metrics

iOS doesn't yet have any delegate method that fires when we have
finished loading all the tiles on the NTP. Without that, it's not
possible to reliably output metrics for tile types. Adding this (after
NUM_RECORDED_TILE_TYPES) will let us proceed with the conversion to
metrics::RecordPageImpression() in the meantime.

BUG=669090
==========

to

==========
Add "UNKNOWN_TILE_TYPE" for metrics

iOS doesn't yet have any delegate method that fires when we have
finished loading all the tiles on the NTP. Without that, it's not
possible to reliably output metrics for tile types. Adding this (after
NUM_RECORDED_TILE_TYPES) will let us proceed with the conversion to
metrics::RecordPageImpression() in the meantime.

BUG=669090

Committed: https://crrev.com/208aa90371f4c7f51ac7745125a076cef6861b75
Cr-Commit-Position: refs/heads/master@{#434985}
==========

[commit-bot: I haz the power, 2016-11-29 14:45:26]

Patchset 1 (id:??) landed as
https://crrev.com/208aa90371f4c7f51ac7745125a076cef6861b75
Cr-Commit-Position: refs/heads/master@{#434985}