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The class is move-only and carries raw thumbnail image data, as well as
the intended device to pixel ratio.

The default constructor is deleted, and the constructor tries
allocating pixels in the bitmap to enforce the use of image info
appropriate for thumbnails to be drawn on an HTML <canvas> element.

Bug: 652400
Change-Id: I16bf97d9b0c06fa64bc0cf891f2fdccf0dbd8058
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376877
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803753}