alternate ntp: fix website page jankiness when suggestions show and top bars are hidden

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

Index: chrome/browser/ui/views/frame/instant_preview_controller_views.cc
diff --git a/chrome/browser/ui/views/frame/instant_preview_controller_views.cc b/chrome/browser/ui/views/frame/instant_preview_controller_views.cc
index abf481acbde25ac4d2eb76722cd19595bb850622..742c4be85d26edf5e3bdfa93419a3af6e6f9f5af 100644
--- a/chrome/browser/ui/views/frame/instant_preview_controller_views.cc
+++ b/chrome/browser/ui/views/frame/instant_preview_controller_views.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/ui/view_ids.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/frame/contents_container.h"
+#include "chrome/browser/ui/views/infobars/infobar_container_view.h"
 #include "ui/views/controls/webview/webview.h"
 
 InstantPreviewControllerViews::InstantPreviewControllerViews(
@@ -51,9 +52,12 @@ void InstantPreviewControllerViews::PreviewStateChanged(
 
   // If an instant preview is added during an immersive mode reveal, the reveal
   // view needs to stay on top.
+  // Notify infobar container of change in preview state.
   if (preview_) {
     BrowserView* browser_view = BrowserView::GetBrowserViewForBrowser(browser_);
-    if (browser_view)
+    if (browser_view) {
       browser_view->MaybeStackImmersiveRevealAtTop();
+      browser_view->infobar_container()->PreviewStateChanged(model);
+    }
   }
 }