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

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https://hg.mozilla.org/integration/gaia-central/rev/e9560ec06728
Author: Eli Perelman <eli@eliperelman.com>
Desc: Merge pull request #26852 from eliperelman/bug-1088118-costcontrol

Bug 1088118 - Adding User Timing markers to Usage app

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https://hg.mozilla.org/integration/gaia-central/rev/ce1e00300eb8
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 1088118 - Adding User Timing markers to Usage app
Bumping manifests a=b2g-bump