[settings-pixel-search] Add slice timeout to avoid showing empty slice view

Bug: 181810946

Test: m
Change-Id: Icd83bbf428bf7d87e3957a6f6d888142c6008da3

src/com/android/launcher3/allapps/search/SearchAdapterProvider.java

@@ -16,6 +16,7 @@
 
 package com.android.launcher3.allapps.search;
 
+import android.net.Uri;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -39,6 +40,11 @@ public abstract class SearchAdapterProvider {
      */
     public abstract void onBindView(AllAppsGridAdapter.ViewHolder holder, int position);
 
+    /**
+     * Called from LiveSearchManager to notify slice status updates.
+     */
+    public abstract void onSliceStatusUpdate(Uri sliceUri);
+
     /**
      * Returns whether or not viewType can be handled by searchProvider
      */