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

========

https://hg.mozilla.org/integration/gaia-central/rev/ee69e9abde3e
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #17930 from davidflanagan/bug990630

Bug 990630: extract the EXIF preview metadata that media frame needs r=jdarcangelo

========

https://hg.mozilla.org/integration/gaia-central/rev/d24179d3a963
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 990630: extract the EXIF preview metadata that media frame needs

don't parse EXIF again when creating thumbnail

Diego's README changes

update tests
Bumping manifests a=b2g-bump