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- Added kArc as a data endpoint type of the clipboard
data.
- Changed the notification strings of the toast shown
when the clipboard data sharing with ARC++ fails.

Bug: 1129345
Change-Id: I8e61ddbb1dc9ea9f36d1965152fe57e471787479
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2428970
Commit-Queue: Aya Elsayed <ayaelattar@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811671}