Fix jank regression from AllAppsRecyclerViewPoolTest

Unit test ag/28323761 delays the preInflationCount check after creating ActivityContext on main thread, thus causing jank regression. This CL is a forward fix.

Fix: 354560500
Flag: NONE - jank fix
Test: Presubmit
Change-Id: I0e91dd765f1805b98895ce90804ec187e50285b4
2 files changed