Bug 919563 - Standardize APK generation. r=glandium

This only handles the simple cases: no mobile/android/base (yet).
Bug 903534 - Part 1: Build background-debug.apk. r=glandium

--HG--
rename : mobile/android/moz.build => mobile/android/tests/background/junit3/moz.build
rename : mobile/android/moz.build => mobile/android/tests/background/moz.build
rename : mobile/android/moz.build => mobile/android/tests/moz.build
Bug 903534 - Part 2: Build and release-sign background.apk. r=glandium
Bug 897162 - Lower Gecko thread priority when showing Top Sites page. r=lucasr
Bug 921255 - Add an UPGRADING file to toolkit/devtools/sourcemap; r=robcee
Bug 911995 - Add escodegen's license to about:license; r=robcee
NO BUG - Deleted unused resource `gecko_actionbar_bg'. r=sriram
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/f175ff825091
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #12344 from overholt/master

Bug 878700 - Untranslated text in 'Enter PIN' screen r=fcampo

========

https://hg.mozilla.org/integration/gaia-central/rev/26ba757e12bc
Author: Andrew Overholt <overholt@mozilla.com>
Desc: Bug 878700 - Untranslated text in 'Enter PIN' screen

Simple s/data-l10-id/data-l10n-id change as suggested by
Staś Małolepszy at in comment 6 of bug 878700.
Bug 905808 - Reuse browser shift code from SelectionHandler to center findbar searches. r=mbrubeck
Merge m-c to fx-team.
Bug 918802 - Move the debugger's pretty printing into a worker; r=past
Increase the test timeout for Bug 918029. r=bbondy
Use a dynamic port for app update xpcshell tests - Bug 894729. r=bbondy
Merge b2g-inbound to m-c