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This CL gets ShareActions from the ShareActionCache and plums
them through to the Sharesheet bubble. It also adds a Share
label to the bubble.

Bug: 1097623
Change-Id: I98d17217f5b0fd1790c9866bb8bed4fc5a05bfed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2301262Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790259}