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Images are requested at the exact resolution required for tiles in the
custom background selection dialog, reducing the overall data loaded.

Bug: 851990
Change-Id: I2e29e6d8f7e888ef4c02fdaf156a360471662435
Reviewed-on: https://chromium-review.googlesource.com/1163293Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Ramya Nagarajan <ramyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580916}