Fixing MainThreadInitializedObject

> Making SafeCloseable implementation mandatory, to prevent leaks during test and preview
> Removing getNoCreate method and defining executeIfCreated to avoid null pointer exceptions
> Fixing sandbox value leaking into main, by Checking sandbox against App context
> Converting sanbox to an interface instead a class

Bug: 335280439
Test: Presubmit
Flag: None
Change-Id: I951dcde871898e745ff6490a1c4f8fd1512888f5

src/com/android/launcher3/model/ItemInstallQueue.java

@@ -45,7 +45,6 @@ import com.android.launcher3.InvariantDeviceProfile;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.LauncherSettings.Favorites;
-import com.android.launcher3.Utilities;
 import com.android.launcher3.logging.FileLog;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.LauncherAppWidgetInfo;
@@ -55,6 +54,7 @@ import com.android.launcher3.shortcuts.ShortcutRequest;
 import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.PersistedItemArray;
 import com.android.launcher3.util.Preconditions;
+import com.android.launcher3.util.SafeCloseable;
 import com.android.launcher3.widget.LauncherAppWidgetProviderInfo;
 
 import java.util.HashSet;
@@ -65,7 +65,7 @@ import java.util.stream.Stream;
 /**
  * Class to maintain a queue of pending items to be added to the workspace.
  */
-public class ItemInstallQueue {
+public class ItemInstallQueue implements SafeCloseable {
 
     private static final String LOG = "ItemInstallQueue";
 
@@ -99,6 +99,9 @@ public class ItemInstallQueue {
         mContext = context;
     }
 
+    @Override
+    public void close() {}
+
     @WorkerThread
     private void ensureQueueLoaded() {
         Preconditions.assertWorkerThread();