Bug 843248 - Upgrading with maintenance service from a non metro build to a metro build does not show tile. r=jimm
Merge the last PGO-green inbound changeset to m-c.
Bug 843248 - Metro tiles sometimes not working because of session 0 detection. r=jimm
Bug 735008 - Land new splash screen and tile images for metro. r=shorlander. DONTBUILD
Backed out changeset 82747d694e7a (bug 716859) for android reftest-2 timeouts
Merge mozilla-central to mozilla-inbound
Bug 842395 - Remove areClientsAvailable() from TabsAccessor. r=mfinkle

--HG--
extra : rebase_source : edca3b7010a8a4cae538ca9632d98e3201a135c1