Bug 898326 - Disable buttons when switching camera. r=djf
Bug 898326 - Quickly tap the switching icon twice that caused image upside down image. r=daleharvey
Merge pull request #11842 from mpizza/Bug_898326_upsidedown_hd

Bug 898326 - Disable buttons when switching camera. r=djf, daleharvey
        uplift two patch from b2g master for fixing bug 898326