This cl adds the pin shortcut option to the context menu, where
it works on Home launcher, hotseat, and pinned apps on the
taskbar.
Currently the option is a no-op.
Bug: 375648361
Test: Manual. Recording uploaded to buganizer
Flag: com.android.launcher3.enable_pinning_app_with_context_menu
Change-Id: I5d1284a6e909fd75f14e81c3ae713da3cdc01ce3
Wen-Chien Wang
2badfc7ebc