Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/2bca7eeedb43
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15315 from dwilsoncaf/bug-947504-v1.3

Bug 947504 - Only enable HwcComposer2D by default if hardware support it - v1.3

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https://hg.mozilla.org/integration/gaia-1_3/rev/a3f8a2ed3bf3
Author: Diego Wilson <dwilson@codeaurora.org>
Desc: Bug 947504 - Only enable HwcComposer2D by default if hardware support it