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The root directory for Android files (the user's "emulated
external storage", which is accessible from Android file picker)
is mounted on a fixed path on Chrome OS side:
/run/arc/sdcard/write/emulated/0.
We need to whitelist the path so that Chrome can open
Android files using file:// protocol.

Bug: 863515
Test: Manually tested on ARC-enabled Kevin device.
Change-Id: Ic48e46b5a55d75630c6e6b06467ab4597345e6e7
Reviewed-on: https://chromium-review.googlesource.com/1170151
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582851}