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

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https://hg.mozilla.org/integration/gaia-central/rev/cd19027a1372
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #21519 from timdream/keyboard-hint-wait

Bug 957031 - 100ms delay for keyboard key highlight, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/1a12292cb81b
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 957031 - 100ms delay for keyboard key highlight
Bumping manifests a=b2g-bump