Refresh thumbnail splash when task icon changes.

This is usually a result of TaskIconCache updating in the background.

Fix: 267744363
Test: manual.
Change-Id: I83620f3774def7ffb07906a6d45b64e9aad6de71

quickstep/src/com/android/quickstep/views/TaskView.java

@@ -1184,6 +1184,10 @@ public class TaskView extends FrameLayout implements Reusable {
         mSnapshotView.setSplashAlpha(mTaskThumbnailSplashAlpha);
     }
 
+    protected void refreshTaskThumbnailSplash() {
+        mSnapshotView.refreshSplashView();
+    }
+
     private void setSplitSelectTranslationX(float x) {
         mSplitSelectTranslationX = x;
         applyTranslationX();