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* Adds 2dips of bottom margin and 2dips of padding between items (for
  all layout modes).
* Uses 4dips of rounded-corner radius under Refresh (already in use
  under touchable).

Bug: chromium:822072
Change-Id: I6fba6c49a01fa5f79cc33fe2e53aa998e350e03b
Reviewed-on: https://chromium-review.googlesource.com/1026392
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553825}