Document unspecified dimensions.

Test: mm

Bug: 77234888
Bug: 109687058
Change-Id: Ia8928e494d8c712bc9cfb592d67476fde9753f45
(cherry picked from commit 8939b5df129777b6597f5f973552ae99ab956b35)
Merged-In: Ia8928e494d8c712bc9cfb592d67476fde9753f45
2 files changed