XPI_NAME affects no tier on its own, as it merely changes paths where
things end up that are defined by other variables.
FILES_PER_UNIFIED_FILE had an erroneous value.
Those are the worst offenders of affected_tiers. The rules to handle
them are all in directories that is not necessarily related to where
the variables are defined, each of which has a Makefile.in for those
rules, which forces export to go through them.
They are respectively using PP_TARGETS and INSTALL_TARGETS. Both affect
the misc tier since bug 1240671, per the *_TARGET value they set in the
backend.
This has the nice side effect of now skipping directories where test
harness files are handled by install manifests.
JAR_MANIFESTS affects the libs tiers through config/rules.mk rules.
While we could move the rules in the backend, they are too complex to
just do that now.
GENERATED_FILES impacts the export tier through the config/rules.mk
definitions, now moved to the backend itself, so that everything is
close to each other.
Those are non-passthru variables with the same property as
ANDROID_GENERATED_RESFILES, ANDROID_APK_NAME and ANDROID_APK_PACKAGE, in
that they don't affect tiers through the backend code itself, but from
the Makefile.in along the moz.build they are defined in.
The are passthru variables that don't actually affect any tier per the
backend itself. They do affect the `export` tier by way of the Makefile.in
along the moz.build defining them, and the existence of those
Makefile.in already guarantees those directories not to be skipped for
`export`.
This initiates a move off affected_tiers in VARIABLES definition to
explicit in-backend handling, which will hopfully make things clearer.
HAS_MISC_RULE is currently used to opt-in to the misc tier in a few
directories with a misc:: rule. It is, in fact, mostly used for custom
xpi creation, which will be separately addressed in bug 1240676, so it
will eventually go away entirely, but in the meantime, we send it as a
throwaway passthru.
Historically, all tiers were handled as opt-out (may_skip), until we
added the first opt-in tier (no_skip). It doesn't make much sense to
differentiate them anymore, so handle them all as opt-in.
When adding a backend, we currently have to add them in three different
places so that they appear in the right places.
Instead, keep the list in a single place.
The timeout timer of a geolocation request holds a strong reference to
the request. This can cause the window to leak if the request is not
completed before the tab containing the window is closed.
To fix this, I made the timer instead hold a strong reference to a
wrapper class that has only a weak reference to the request. The
request destructor must now cancel the timeout timer.
I also outlined a call to StopTimeoutTimer() in
nsGeolocationRequest::Shutdown().
