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Adds the context menu and the code for the homescreen shortcut.

Bug: 955514
Change-Id: I851059a23d1283340e453f1a2f00280cebd93142
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1589375
Commit-Queue: Brandon Wylie <wylieb@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656491}