Show current app name shortcut helper

At the moment, the shortcut helper will not show the name of the
current app, just its shortcuts, which makes it a bit confusing.
This CL addresses that. Icon will be added on a later CL once
the styling has been fully defined.

Bug: 325252986
Test: Flashed on device, tested with Keep, Launcher and Chrome
Flag: NONE
Change-Id: Ie39645e8de7185f01e3997ed2ab1c3718e8f128f