Add frame timeline to veil surfaces in maximize CUJ

To show expected/actual frames for the veil's background and icon during
the maximize/restore CUJ.

Flag: EXEMPT bugfix
Fix: 369365149
Test: verify perfetto trace shows expected and actual frames for these
two surfaces

Change-Id: I6f67a4298ea752eb5474d384eca56d5d20859aa3
1 file changed