Contextual cards are not bound to homepage. Remove prefix homepage from
layout and theme names.
Next step: update names for some resource values (dimen/color etc)
Bug: 130250419
Test: rebuild
Change-Id: I5e901268462aaa37e00493080ae09af001784823
mIsHalfWidth in ContextualCard is too generic to identify its
responsibility, it is used to hold the value of is_support_half from
database and used to decide the card width. Also, it limits the
relationship of CardType-to-Renderer not to be extended to one-to-many.
To deal with this, we replaced mIsHalfWidth with mViewType to implement
one-to-many relationship of CardType-to-Renderer, and removed all
related logic of mIsHalfWidth.
Bug: 121303357
Test: robotests, visual
Change-Id: I03e14392272194424f317d11bf9d0d794a6133f4
