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The prior code incorrectly cropped the backdrop-filtered content on
the ChromeOS Shelf. This fixes that problem.

Bug: 920296, 923022
Change-Id: Idfee932a67b4f8baa2ad9351268384b3b059d72b
Reviewed-on: https://chromium-review.googlesource.com/c/1415171
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625777}