[OneSearch] Add onesearch plugin api to trigger image from URL.

Bug: 199289915
Test: manual

Change-Id: Ib96de90f87214ea7bd224d0c543cc9578527366e

src_plugins/com/android/systemui/plugins/OneSearch.java

@@ -40,4 +40,7 @@ public interface OneSearch extends Plugin {
      * @param query The query to get the search suggests for.
      */
     ArrayList<Parcelable> getSuggests(Parcelable query);
+
+    /** Get image bitmap with the URL. */
+    Parcelable getImageBitmap(String imageUrl);
 }