Extract window related perf test base classes

Add WindowPerfTestBase and WindowPerfRunPreconditionBase
into apct-perftests-utils. So window manager and input
method manager can share the same functions.

Bug: 174292015
Test: WmPerfTests ImePerfTests
Change-Id: Ie2818536d6611d1ba5f4b6cd725cd2d4a95e1cac