Bring back Keyguard CANNED_UNLOCK_START_DELAY wait

This was taken out in I7bc350689affde76f9d3427ea94ff31f56bb75f0 because
I didn't think it was necessary, but it skipped over the "widgets going
away" animation inside the notification shade, so we really need it.

Bug: 281859780
Bug: 283077960
Test: atest KeyguardUnlockAnimationControllerTest
Change-Id: Id4db8771c668767d0c0738c486dd7c711a4941ea

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardUnlockAnimationController.kt

@@ -664,8 +664,24 @@ class KeyguardUnlockAnimationController @Inject constructor(
         // visible, hide our smartspace.
         lockscreenSmartspace?.visibility = View.INVISIBLE
 
-        // Start an animation for the wallpaper, which will finish keyguard exit when it completes.
-        fadeInWallpaper()
+        // As soon as the shade has animated out of the way, start the canned unlock animation,
+        // which will finish keyguard exit when it completes. The in-window animations in the
+        // Launcher window will end on their own.
+        handler.postDelayed({
+            if (keyguardViewMediator.get().isShowingAndNotOccluded &&
+                !keyguardStateController.isKeyguardGoingAway) {
+                    Log.e(TAG, "Finish keyguard exit animation delayed Runnable ran, but we are " +
+                            "showing and not going away.")
+                return@postDelayed
+            }
+
+            if (wallpaperTargets != null) {
+              fadeInWallpaper()
+            } else {
+                keyguardViewMediator.get().exitKeyguardAndFinishSurfaceBehindRemoteAnimation(
+                    false /* cancelled */)
+            }
+        }, CANNED_UNLOCK_START_DELAY)
     }
 
     /**