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The QR standard says that the mask should be auto-selected, not fixed to
three, and specifies a fitness function for choosing the best mask for
each QR code.

This change adds support for that and lets the caller specify a mask if
it really wants … say if it wanted to cycle through a series of QR codes
for the same data with a dancing dinosaur on top.

Change-Id: Ief4dedce236aa2ae13cc94b2248a17a0488f88ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365222
Commit-Queue: Adam Langley <agl@chromium.org>
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#800326}