OutputPage: Add accessors for some protected properties

Bug: T76168
Change-Id: Iee11c217b6b0d35acfdfac916814521acda2b1a4
(cherry picked from commit 0406f3d61b1bd4ac29a4017dd274e8831ad20a3b)
Merge "OutputPage: Add accessors for some protected properties" into REL1_24