Guarantee transitions always update occlude status

Previously if the dream transition animation was not played, because eg.
dream was already showing before Keyguard but a transition was still set,
Keyguard would not log that it needs to be occluded now.

onAnimationStart is wrapped and return value checked to have a fallback
in case onAnimationStart doesn' startAnAnimation.

Change-Id: I00dd31606ed08b67666a58f1b3e2f0f3b31fcaa6
Test: Currently manual - start dream and then lockNow(null)
Bug: 270414686

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -966,13 +966,24 @@ public class KeyguardViewMediator implements CoreStartable, Dumpable,
                 public void onAnimationStart(int transit, RemoteAnimationTarget[] apps,
                         RemoteAnimationTarget[] wallpapers, RemoteAnimationTarget[] nonApps,
                         IRemoteAnimationFinishedCallback finishedCallback) throws RemoteException {
+                    if (!handleOnAnimationStart(
+                                transit, apps, wallpapers, nonApps, finishedCallback)) {
+                        // Usually we rely on animation completion to synchronize occluded status,
+                        // but there was no animation to play, so just update it now.
+                        setOccluded(true /* isOccluded */, false /* animate */);
+                    }
+                }
+
+                private boolean handleOnAnimationStart(int transit, RemoteAnimationTarget[] apps,
+                        RemoteAnimationTarget[] wallpapers, RemoteAnimationTarget[] nonApps,
+                        IRemoteAnimationFinishedCallback finishedCallback) throws RemoteException {
                     if (apps == null || apps.length == 0 || apps[0] == null) {
                         if (DEBUG) {
                             Log.d(TAG, "No apps provided to the OccludeByDream runner; "
                                     + "skipping occluding animation.");
                         }
                         finishedCallback.onAnimationFinished();
-                        return;
+                        return false;
                     }
 
                     final RemoteAnimationTarget primary = apps[0];
@@ -982,7 +993,7 @@ public class KeyguardViewMediator implements CoreStartable, Dumpable,
                         Log.w(TAG, "The occluding app isn't Dream; "
                                 + "finishing up. Please check that the config is correct.");
                         finishedCallback.onAnimationFinished();
-                        return;
+                        return false;
                     }
 
                     final SyncRtSurfaceTransactionApplier applier =
@@ -1031,6 +1042,7 @@ public class KeyguardViewMediator implements CoreStartable, Dumpable,
 
                         mOccludeByDreamAnimator.start();
                     });
+                    return true;
                 }
             };