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Add a new CircularProgressView to be used in various places in downloads
home.  This currently supports styling and the initial small/large
progress bar style buttons that we need.

BUG=868554

Change-Id: I68aaea3984e5cd3ff62b1ec6a298a409f5d00b08
Reviewed-on: https://chromium-review.googlesource.com/1220177
Commit-Queue: David Trainor <dtrainor@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591362}