[roll] Roll fuchsia [flatland] Retry of 'Fix DisplayCompositorPixelTests Flake'

Update tests to properly wait for vsyncs before
reading back from the display.

Only apply this to tests making use of the real display.

Original-Fixed: 104169
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/700132
Original-Revision: 903e0b80249701876984a2fd2052f37bfa50aa42
GitOrigin-RevId: 29b57e99803965760a62e892b325098473e8e831
Change-Id: I7951d323bc2473bc2c02f8a470de7687a542ef02
diff --git a/stem b/stem
index b8e4582..874673b 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="d08aa7a9011e75f62fae0268d78c8cc8866f218d"/>
+             revision="903e0b80249701876984a2fd2052f37bfa50aa42"/>
   </projects>
   <hooks>
     <hook name="install-environment"