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

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https://hg.mozilla.org/integration/gaia-central/rev/836a79e8b6a6
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #14698 from RudyLu/keyboard/Bug950573-keyboard_app_init_flow

Bug 950573 - Built-in Keyboard app could not input keys after it resumed...
r=timdream, gary

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https://hg.mozilla.org/integration/gaia-central/rev/f3503ee93354
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 950573 - Built-in Keyboard app could not input keys after it resumed
from OOM
  - Correct the keyboard app init flow, so that it would show the
    keyboard after input method engine has bee loaded