Bug 888841 - To use the specific value from device makefile for GAIA_DEV_PIXELS_PER_PX. r=timdream.
Merge pull request #10784 from marcofreda527/v1.1.0hd

Bug 888841 - To use the specific value from device makefile for GAIA_DEV_PIXELS_PER_PX. r=timdream