ClientChannelHelperParent is the thing creating the ClientInfos which aren't
backed by existing ClientSources, so it may make sense for CCHP to tell the
ClientManagerService (CMS) to "expect" or "forget" a "future"
ClientSource(Parent).
When such a ClientInfo is created, CCHP notifies the CMS that a future
ClientSource may be created. This notification has to be observed before any
ClientHandles try to query CMS to a ClientSourceParent, which is the case
because the notification as well as ClientHandleParent constructors occur over
PBackground, and the notification sending method is called first.
CMS is told to forget the future ClientSource whenever a redirect occurs that
would result in the creation of a new ClientSource (i.e. a new ClientInfo). It's
also possible that the ClientInfo's LoadInfo's channel is cancelled. To account
for this, CHCP stores the most recent ClientInfo it's created and tells CMS
to _possibly_ forget the associated future ClientSource in its destructor. It's
possible that the channel completed its load, in which case this notification
is a no-op. This also relies on CHCP being destroyed after the reserved
ClientSource has a chance to both be created and register its
ClientSourceParent.
Differential Revision: https://phabricator.services.mozilla.com/D66529
--HG--
extra : moz-landing-system : lando
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