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Adding the buttons and messages for the Switch Access cut, copy, and paste
functionality. This includes adding the image files for the icons, added
strings and translation screenshots, and adding the buttons into the menu
manager so they appear in the menu.

Bug: 982004
Change-Id: I35e9b3b3dfe48b1730c23317115ee96be89141bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719292Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Commit-Queue: Rose Garcia <rosalindag@google.com>
Cr-Commit-Position: refs/heads/master@{#682453}