This will prevent scaling artifacts due to odd densities. We will not
make any adjustments to the "normal" density, which will preserve
tvdpi or whatever the device manufacturer needed to use.
Rounding the density down is always safe, since it will not push us
below our 320dp lower bound on minimum effective screen dimension.
Bug: 27225670
Change-Id: Ib084bb3d4fc70a59106ac74df5394c21e9f8c7bd
Also cleans up unnecessary 0s and moves tint to the proper place in
relevant vector drawable XML files.
Preview layout is still WIP pending UX input, but I wanted to get this
CL in place so that we can test/demo the feature ASAP.
Bug: 22450672
Change-Id: Ic3f1500006c763df99fba2d1d16782b89d6fcae1
