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This adds back the "Create Shortcut" functionality to chrome://apps for
the BMO system.

R=loyso@chromium.org

Bug: 1009302, 1069298
Fixed: 1069293
Change-Id: Ic14e71155a0eb7a6a02fb5a82aab9c3362f8b015
Tested: Manually, with BMO turned on and off
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121421
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758029}