permissions: add layout tests for multiple requests
No permisisons, single, multiple and duplicate permissions
are all tested. Permission updates being reflected in the request
is also tested.
BUG=
516626
Committed:
https://crrev.com/4a5a84a2a326cecc6d183478ca684aea753adc18
Cr-Commit-Position: refs/heads/master@{#352015}