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

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https://hg.mozilla.org/integration/gaia-central/rev/3aec4ddbcde3
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #12945 from bmac/927744

Bug 927744 - [Keyboard] Keyboard app loses "inputContext" object when sw... r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/5378f3d378d1
Author: bmac <bmac325@GMail.com>
Desc: Bug 927744 - [Keyboard] Keyboard app loses "inputContext" object when switching layouts