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The current base32 component only has an encoder. A decoder would be
valuable, especially in testing situations where the input of the
encoder can be compared to decoded output of the encoder.

Change-Id: Ic675bb7dff405237d04f563f465a89966270bce4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865545Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708055}