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Instead of SendText and SendFiles methods this now has one unified
SendAttachments methods to make it easier to handle Attachments coming
in from the UI. Also hooks it up through the DiscoveryManager all the
way to NearbySharingService. File URLs coming from the ShareSheet on
ChromeOS are converted to FileAttachments.

Bug: 1085067
Change-Id: I61ce93842920ffa303ee71f4373c237b113948bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378026Reviewed-by: Alex Chau <alexchau@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802242}