in progress ios

Change-Id: I34f5bdccc3e37951875cea4ba05ffa1b94cbe2bc
more iOS changes and depth peeling fix

Change-Id: I64e5894927b5b2733b68dbb73841ee747439772a
Merge topic 'ios' into master

a16c21e3 more iOS changes and depth peeling fix
618841c5 in progress ios