Notify draw for relaunch with preserved window

In case any logic depends on ActivityRecord#startRelaunching
~ WindowState#finishDrawing can receive paired invocation.

Fix: 264634241
Test: An activity calls recreate().
      There will be a log "finishDrawing of relaunch: Window".
Change-Id: I9406ab5cbca5b3c9c407a136bf4fcb97111d78b8

core/java/android/view/ViewRootImpl.java

@@ -1116,6 +1116,8 @@ public final class ViewRootImpl implements ViewParent,
         // Update the last resource config in case the resource configuration was changed while
         // activity relaunched.
         updateLastConfigurationFromResources(getConfiguration());
+        // Make sure to report the completion of draw for relaunch with preserved window.
+        reportNextDraw("rebuilt");
     }
 
     private Configuration getConfiguration() {