Fix the TabScrubber always starting from the first tab in full screen mode.

chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc

Index: chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
diff --git a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
index d7da4c5a4e3c3d5a2b927b7bfa98ed82dfc10887..b0fbba7bd3240a997f49baaf01ae96063fe45eaf 100644
--- a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
+++ b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc
@@ -275,6 +275,8 @@ void ImmersiveModeControllerAsh::OnImmersiveRevealEnded() {
   browser_view_->top_container()->DestroyLayer();
   UpdateTabIndicators();
   LayoutBrowserRootView();
+  for (Observer& observer : observers_)
+    observer.OnImmersiveRevealEnded();
 }
 
 void ImmersiveModeControllerAsh::OnImmersiveFullscreenExited() {