Pass plugin/theme update objects to upgrader & add plugin/theme autoupdate stats

[dd32]

The Background Updater functionality has always had the ability for users to opt-in for plugin & theme autoupdates through the usage of plugins or filters, but we've got no stats on the effectiveness of any of these updates, or, if they're experiencing different rates of success (be it better or worse).

Currently we report autoupdate statistics to WordPress.org for Core Updates, these have been invaluable for evaluating the Background Updates successes and failures, so it makes sense to record similar data for plugins & themes as well.

Due to #27365 we only have a success or failure available to us (and no idea why it failed), but it's enough data for this purpose for now.

In adding these stats, it was discovered that we were incorrectly passing plugin/theme slugs to the updater, rather than the update offerings (which we do for Core & Translations), this change brings it inline with the expected behaviour and documentation.
There should be no significant breakage caused by that, in the worst case scenario someone who has explicitly opted in to receive updates for a single plugin may no longer do so, those who simply opted in to receive all updates (through add_filter( 'auto_update_plugin', '__return_true' ); as most tutorials suggest) would see no change.

[dd32]

In 27905:

Background Updates: Record Plugin & Theme update statistics like we for for Core updates, Pass Plugin/Theme update objects into the Background updater for consistency with Core & Translations. See #27633

[nacin]

In 27923:

Background Updates: Record plugin & theme update statistics like we do for core updates.

Pass plugin/theme update objects into the Background updater for consistency with core & translations.

Merges [27905] to the 3.8 branch.

props dd32.
fixes #27633.

[nacin]

In 27924:

Background Updates: Record plugin & theme update statistics like we do for core updates.

Pass plugin/theme update objects into the Background updater for consistency with core & translations.

Merges [27905] to the 3.7 branch.

props dd32.
fixes #27633.

[DrewAPicture]

Getting some warnings on plugin and theme upgrades following [27905]:

PHP Warning:  json_encode(): recursion detected in /srv/www/trunk/src/wp-includes/update.php on line 261
PHP Warning:  json_encode(): recursion detected in /srv/www/trunk/src/wp-includes/update.php on line 405

[dd32]

Replying to DrewAPicture:

Getting some warnings on plugin and theme upgrades following [27905]:

PHP Warning:  json_encode(): recursion detected in /srv/www/trunk/src/wp-includes/update.php on line 261
PHP Warning:  json_encode(): recursion detected in /srv/www/trunk/src/wp-includes/update.php on line 405

Are these occurring during auto updates? Manual updates? A specific page?

[dd32]

r27906 is also supposed to be here, I missed including a Ticket reference.

[dd32]

In 27928:

Background Updates: Fix a PHP Warning caused by a Upgrader instance being passed into the Theme & Plugin $extra_stats parameter. See #27633

[dd32]

In 27929:

Background Updates: Fix a PHP Warning caused by a Upgrader instance being passed into the Theme & Plugin $extra_stats parameter.
Background Updates: Fix two variable typos in r27905

Merges [27906], [27928] to the 3.8 branch.
Fixes #27633.

[dd32]

In 27930:

Background Updates: Fix a PHP Warning caused by a Upgrader instance being passed into the Theme & Plugin $extra_stats parameter.
Background Updates: Fix two variable typos in r27905

Merges [27906], [27928] to the 3.7 branch.
Fixes #27633.

[dd32]

#27653 was marked as a duplicate.

[dd32]

#27654 was marked as a duplicate.