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This CL adds the SetSharesheetSize function to SharesheetController
which can be called to resize the sharesheet to a given size. The
anchor position in the sharesheet bubble is updated to accommodate
the new bubble sizing.

Bug: 1097623
Change-Id: I0093c4b7ae69119928d677bed12cd19ca7d64e1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362067
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799506}