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

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https://hg.mozilla.org/integration/gaia-central/rev/19756fa13aa0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1007147 - [Home2] Follow-up, add overflow: hidden to icons to prevent x-axis panning r=me
Bumping manifests a=b2g-bump
Bug 1006128 - Fix IPDL unit tests after bug 960774, r=bsmedberg.
Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e121aac89613
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1004768 - [Home2] Remove will-change property as it hurts scrolling performance with too many individual layers r=me
Bumping manifests a=b2g-bump
Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5476e49adf00
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #19079 from punamdahiya/Bug994529

Bug994529 - [Gallery][Wallpaper] The left upper of interface cannot be d.isplayed for a short time when set picture as wallpaper r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/350bbedbccab
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug994529 - [Gallery][Wallpaper] The left upper of interface cannot be displayed for a short time when set picture as wallpaper
Bumping manifests a=b2g-bump
Bug 999694 - Use fence objects in SharedSurfaceGralloc, r=jgilbert
Backed out changeset 21d743a319c6 (bug 967475) for apparently introducing two hazards to the build
Backed out changeset 34f9b78948b9 (bug 999694) for gl bustage on a CLOSED TREE
Merge b2g to m-c