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ARC app.mojom is modified to return the foreground and background files
separately to generate the ARC app standard icon on the Chromium side,
so modify the fake app instance to return the foreground and background
data to keep consistent with the mojom change, and the ARC side return
value.
DD: go/appservice-adaptive-icon

BUG=1083331

Change-Id: I9147be31ffbea4fa2d647fe90667a09a8781feeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389742Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804736}