GitLab

This CL is a small step to make chips more reusable. It moves the Chips
view as defined for the Downloads Home into a separate View located in
ui/.
This has very little visible effects:
  * Chip appearance is now consistent for Downloads on Kitkat and older
  * The corner radius of chips is variable (important for accessory)
  * RippleBackgroundHelper allows backgrounds with colored borders

Right now, presubmits will complain about the new text style. I'm open
for any tips where the TextAppearance should be defined.

Bug: 914781
Change-Id: I10b84d933a6e5fc98665e942f75e336bb9cc6bd1
Reviewed-on: https://chromium-review.googlesource.com/c/1380013
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619938}