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

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

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/frame/instant_preview_controller_views.h"
 
 #include "chrome/browser/instant/instant_model.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #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(
     Browser* browser,
     ContentsContainer* contents)
     : InstantPreviewController(browser),
       contents_(contents) {
 }
 
 InstantPreviewControllerViews::~InstantPreviewControllerViews() {
@@ skipping 21 matching lines @@
     preview_->SetWebContents(NULL);
     contents_->SetPreview(NULL, NULL, model.mode(), 100, INSTANT_SIZE_PERCENT,
                           false);
     preview_.reset();
   }
 
   browser_->MaybeUpdateBookmarkBarStateForInstantPreview(model.mode());
 
   // 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);
+    }
   }
 }