Consolidate updating bounds in ActivityStarter.

ActivityStarter updates the bounds of the host stack or task in
multiple places. This changelist consolidates this duplicated logic
into a single place and adds tests to ensure the expected behavior.

This change also makes ActivityStack create its controller using the
same WindowManagerService instance as its ActivityStackSupervisor.

Fixes: 67091889
Bug: 64144308
Test: bit FrameworksServicesTests:com.android.server.am.ActivityStarterTests
Change-Id: Ibaa8f7966bbeb190723caab0d2788c79cf848f04