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The explainer is being updated to indicate that websites should use
the presence of 'files' and 'request' to determine the cause of
launches.

Note: This API is hidden behind the NativeFileSystemAPI and
FileHandling blink flags.

Bug: 829689
Change-Id: Ia8a39ce36fee06281ab51e03c3ad2db401c105c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672611
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671988}