Correctly distribute weight to pre-measured zero-dimension views

Previously, the measurements obtained from LinearLayout when using
EXACTLY and AT_MOST modes would be different even if the resulting
height was the same. This was the result of non-EXACTLY measurement
accounting for the size of zero-dimension views and then redistrib-
uting space as though they had initally been set as AT_MOST, whereas
EXACTLY would always redistribute space as though they had initially
been set as zero-dimension.

Makes perfect sense, right?

This CL updates non-EXACTLY measurement to always calculate the
minimum dimensions requested by zero-dimension views, but then to
redistribute the space according to weight.

Bug: 22810327
Change-Id: Iba8a3d26f2724e5fa9a30457119b4564eb285edb