App Pairs: Implement app pairs icon

[App Pairs 5/?]

This patch implements the app pairs icon, which displays the two member apps and rotates with the device.

Flag: ENABLE_APP_PAIRS (set to false)
Bug: 274835596
Test: Manual
Change-Id: I07085339d1e2d28f004c1661f0948c59e605c76a
3 files changed