Created min size for print preview dialog and modified to allow the

components/constrained_window/show_modal_dialog_views.cc

 // Copyright 2016 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 <memory>
 
 #include "components/constrained_window/constrained_window_views.h"
 #include "components/constrained_window/native_web_contents_modal_dialog_manager_views.h"
 #include "components/web_modal/single_web_contents_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/browser/web_contents.h"
+#include "ui/base/accelerators/accelerator.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace constrained_window {
 
 void ShowModalDialog(gfx::NativeWindow dialog,
                      content::WebContents* web_contents) {
   web_modal::WebContentsModalDialogManager* manager =
       web_modal::WebContentsModalDialogManager::FromWebContents(web_contents);
   DCHECK(manager);
   std::unique_ptr<web_modal::SingleWebContentsDialogManager> dialog_manager(
       new constrained_window::NativeWebContentsModalDialogManagerViews(
-          dialog, manager));
+          dialog, manager, false, NULL));
   manager->ShowDialogWithManager(dialog, std::move(dialog_manager));
 }
 
+void ShowTopLevelModalDialog(gfx::NativeWindow dialog,
+                               content::WebContents* web_contents,
+                               ui::AcceleratorTarget* target) {
+  web_modal::WebContentsModalDialogManager* manager =
+      web_modal::WebContentsModalDialogManager::FromWebContents(web_contents);
+  DCHECK(manager);
+  std::unique_ptr<web_modal::SingleWebContentsDialogManager> dialog_manager(
+      new constrained_window::NativeWebContentsModalDialogManagerViews(
+          dialog, manager, true, target));
+  manager->ShowDialogWithManager(dialog, std::move(dialog_manager));
+}
 }  // namespace constrained_window