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Add new properties |progress| and |hasError| to nearby-progress, which
allow setting a specific progress percentage and disabling the spinner
during error states respectively.

|progress| defaults to null. When null, a waiting animation is shown
where the progress bar spins around the icon. |progress| will be used
in future CLs to set specific progress percentages, but for now, only
the default is used.

|hasError|=true causes the progress bar to be red, icons to be grey,
progress to be 100%, and stops any spinning animation.

Bug: b/163036847
Change-Id: I74d88a1e4efefb6a5e73ba1fd77880b3397bc353
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542850
Commit-Queue: Curt Clemens <cclem@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#828502}