Wait for both window and layer to be visible and window to be pinned before considering the app in pip mode

Bug: 277761298
Test: atest WMShellFlickerTests
Change-Id: I2334a7bb8eecc9542f5201f5c8aff8457d26459f

tests/FlickerTests/src/com/android/server/wm/flicker/helpers/PipAppHelper.kt

@@ -250,7 +250,10 @@ open class PipAppHelper(instrumentation: Instrumentation) :
             waitConditions = arrayOf(ConditionsFactory.hasPipWindow())
         )
 
-        wmHelper.StateSyncBuilder().withPipShown().waitForAndVerify()
+        wmHelper.StateSyncBuilder()
+            .withWindowSurfaceAppeared(this)
+            .withPipShown()
+            .waitForAndVerify()
     }
 
     /** Expand the PIP window back to full screen via intent and wait until the app is visible */