Clear the ViewTranslationResponse on finishing UiTranslation.

Stored state should be cleared here.

This fixes a bug where the views cannot be re-translated after
UiTranslationManager#finishTranslation was called. Some of the state was
cleared, so the translations cannot be re-shown. And that state cannot
be recreated because we find the same ViewTranslationResponse stored and
do not recreate the other state.

Fix: 189892928
Test: manual - translate an app, go to the home screen (triggers
 finish), go back to the app and re-translate
Test: atest CtsTranslationTestCases
Change-Id: Ic81fbce7ee09eb72352071c8bdd94a2731826009

core/java/android/view/View.java

@@ -30942,6 +30942,16 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         mViewTranslationResponse = response;
     }
 
+    /**
+     * Clears the ViewTranslationResponse stored by the default implementation of {@link
+     * #onViewTranslationResponse}.
+     *
+     * @hide
+     */
+    public void clearViewTranslationResponse() {
+        mViewTranslationResponse = null;
+    }
+
     /**
      * Called when the content from {@link View#onCreateVirtualViewTranslationRequests} had been
      * translated by the TranslationService.

core/java/android/view/translation/UiTranslationController.java

@@ -155,6 +155,7 @@ public class UiTranslationController {
                 destroyTranslators();
                 runForEachView((view, callback) -> {
                     callback.onClearTranslation(view);
+                    view.clearViewTranslationResponse();
                     if (view.hasTranslationTransientState()) {
                         view.setHasTransientState(false);
                         view.setHasTranslationTransientState(false);