So far we've been Waiting for the next frame but it doesn't
mean that it will be visible on the screen.
We're usually rendering with 2 buffers and it's possible that
we'll switch the display power mode before anything has hit
the display.
Increased the timeout for now until we have a better alternative.
Change-Id: I63afc8a9139a4ccbba4f16f5569717e22217da9a
Fixes: 72527083
Test: manual
Test: packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
0791d97e11