Support addWindow as other user

Support addWindow with the other userId which can be different from Uid.

This can be used when client want to addView for secondary user.
Example:
1. Create context with createContextAsUser or similar method.
2. Get WindowManager with this context.
3. WindowManager#addView

Bug: 151414297
Test: atest WmTests WindowAddRemovePerfTest AddWindowAsUserTest
Change-Id: I13e58d76b1f056f3829bc984c2b61496c8f8d535