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This CL adds targets to the sharesheet bubble and lifecycle
support for those targets. Clicking on a ShareAction target
now triggers the bubble to show the ShareActionView.

Bug: 1097623
Change-Id: Ibbe829f3ea303588fcc90eb2ae9d7d1b662fc0bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2305820
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790341}