make LinearColorBar themeable

Move colors to resources and use them instead.

PS2: Fix typo

AICP'fied.

Change-Id: I923e5daa219f302dc24e62faab666483109e6620
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge "make LinearColorBar themeable" into kitkat