Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/fae86c3a22aa
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #23118 from davidflanagan/bug1051172-v2.0

Bug 1051172: a stoprecording event hack so the camera can stop recording more quickly on app transitions. r=kgrandon,justindarc a=2.0+

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https://hg.mozilla.org/integration/gaia-2_0/rev/ed39f544fbba
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1051172: send a 'stoprecording' signal from the system app so that the camera can stop recording quickly on app transitions r=kgrandon,justindarc a=2.0+

only send the special signal if an app is currently recording

fix the system app and camera unit tests

add tests for shared/js/stop_recording_event.js
Bumping manifests a=b2g-bump