[Pkg-chromium-maint] Bug#763421: Enable HiDPI for Chromium

[Sean DuBois]

Package: chromium
Version: 37.0.2062.120-2

The Ubuntu build of Chrome starting with
https://launchpad.net/ubuntu/+source/chromium-browser/33.0.1750.152-0ubuntu1~pkg995.1
enables the following flags for hidpi. Can we do the same?

# get resources for high dpi and touch
GYP_DEFINES += use_aura=1
GYP_DEFINES += enable_hidpi=1
GYP_DEFINES += enable_touch_ui=1

thanks!