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Add feature flag for copying image to system clipboard.

Bug: 163201
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8110f65f739891b01b82b866215b122dd93ac0aa
Reviewed-on: https://chromium-review.googlesource.com/1112661
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570085}