GitLab

Adds a setter for the thumbnail element to accept an ImageData object
with which to paint the canvas of its thumbnail. The canvas is sized
according to the dimensions of the image and the screen resolution.

Bug: 652400
Change-Id: I885a1524cadd55731d90bfd0a8d2c4788beb1370
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430728Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811406}