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Previously, we have ShortcutSource.WEBAPK_SHARE_TARGET to show
chrome is launched as a result of user sharing text. As we
introduce the ability for WebAPK to receive file sharing,
we add ShortcutSource.WEBAPK_SHARE_TARGET_FILE to show
that chrome is launched as a result of binary file sharing.

Change-Id: Id21d055baad3e5ff1ddb55309d1e6b278f144117
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1668089
Commit-Queue: Henry Jian <hzjian@google.com>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671346}