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Per change in product requirements, the "Copy to clipboard" context menu
command is now "Copy image" and will only be shown for holding space
items which are backed by an image file.

When executed, "copy image" will read, decode, and write the backing
file's image contents to the clipboard buffer so as to be available to
the user for pasting.

Bug: 1126274
Change-Id: I4575589c01fd5702cbefae0d5830362269df7e22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419920Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#809561}