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This change implements the functions added to the virtual keyboard
private api for interacting with the clipboard history. The functions
implemented are GetClipboardHistory, PasteClipboardItem, and
DeleteClipboardItem.

Bug: 1099318
Change-Id: I8d19947def36359164bdd97f55a182f6fac30d73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569100Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840387}