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Populates IntentFilter for PWAs with share targets.

Spec:
https://w3c.github.io/web-share-target/level-2/

Both single files (kIntentActionSend)
and multiple files (kIntentActionSendMultiple)
may be shared.

Bug: 1125880
Change-Id: I39a63cbad3bb1b765185a008cc74927152b34a2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434079
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812041}