Add delay after installing dummy app

- Testing hypothesis that it's taking a while for the app to be
  properly installed and showing in all apps

Bug: 256659409
Test: com.android.launcher3.ui.TaplTestsLauncher3#testUninstallFromAllApps
Change-Id: Icb1bb8bb9d98751ac8c97b300ecc39372f39c345
diff --git a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
index cf5f5fc..b5255e0 100644
--- a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
+++ b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
@@ -29,6 +29,7 @@
 
 import android.content.Intent;
 import android.graphics.Point;
+import android.os.SystemClock;
 import android.platform.test.annotations.IwTest;
 
 import androidx.test.filters.LargeTest;
@@ -492,6 +493,8 @@
     public void testUninstallFromAllApps() throws Exception {
         TestUtil.installDummyApp();
         try {
+            // b/256659409
+            SystemClock.sleep(5000);
             Workspace workspace = mLauncher.getWorkspace();
             final HomeAllApps allApps = workspace.switchToAllApps();
             allApps.freeze();