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This CL adds the support to share a Google Drive folder in Sharesheet.

BUG=1097623, 1128829

Change-Id: I30dffaa3428cc82e0209ff52abfa97e757a273f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434118Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811583}