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Also, allow usage of fixed size image to prevent scaling-up the QR code
(it becomes too big to be scanned effectively).

Sample:
https://screenshot.googleplex.com/xYWmsrTzZpD.png

Bug: 1064990
Change-Id: Ibd1e7f5f1149e436929ca8c33b1dae7807172411
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153391
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761167}