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Currently, the thumbnail image for the current wallpaper is distorted
if the wallpaper image is the user's file (not provided by Google).
Instead of resizing the image to a distorted state for the current
wallpaper thumbnail, this CL ensures that the thumbnail image is scaled
properly and center cropped.

Before screenshot--
https://screenshot.googleplex.com/mBZziQFOf3W

After screenshot--
https://screenshot.googleplex.com/OjYfOhyfFSK

Fixed: 985542
Change-Id: Idf698141a7ac6b38e797d9bd91d256ce5ea02db4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911229
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714729}