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

chrome/browser/printing/print_preview_dialog_controller.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
 
 #include <map>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "chrome/browser/ui/webui/constrained_web_dialog_ui.h"
 #include "components/sessions/core/session_id.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "ui/web_dialogs/web_dialog_delegate.h"
 
 class GURL;
 
 namespace content {
 struct LoadCommittedDetails;
 class RenderProcessHost;
 class WebContents;
 }
 
 namespace printing {
+  ui::WebDialogDelegate * GetPrintPreviewDialogDelegate(
+      content::WebContents * initiator);
 
 // For print preview, the WebContents that initiates the printing operation is
 // the initiator, and the constrained dialog that shows the print preview is the
 // print preview dialog.
 // This class manages print preview dialog creation and destruction, and keeps
 // track of the 1:1 relationship between initiator tabs and print preview
 // dialogs.
 class PrintPreviewDialogController
     : public base::RefCounted<PrintPreviewDialogController>,
       public content::NotificationObserver {
@@ skipping 35 matching lines @@
 
   // Returns true if |url| is a print preview url.
   static bool IsPrintPreviewURL(const GURL& url);
 
   // Erase the initiator info associated with |preview_dialog|.
   void EraseInitiatorInfo(content::WebContents* preview_dialog);
 
   bool is_creating_print_preview_dialog() const {
     return is_creating_print_preview_dialog_;
   }
+ protected:
+  ~PrintPreviewDialogController() override;
+
+  virtual ConstrainedWebDialogDelegate * GetWebDialogDelegate(
+      content::WebContents* initiator);
 
  private:
   friend class base::RefCounted<PrintPreviewDialogController>;
 
   // 1:1 relationship between a print preview dialog and its initiator tab.
   // Key: Print preview dialog.
   // Value: Initiator.
   using PrintPreviewDialogMap =
       std::map<content::WebContents*, content::WebContents*>;
 
-  ~PrintPreviewDialogController() override;
-
   // Handler for the RENDERER_PROCESS_CLOSED notification. This is observed when
   // the initiator renderer crashed.
   void OnRendererProcessClosed(content::RenderProcessHost* rph);
 
   // Handler for the WEB_CONTENTS_DESTROYED notification. This is observed when
   // either WebContents is closed.
   void OnWebContentsDestroyed(content::WebContents* contents);
 
   // Handler for the NAV_ENTRY_COMMITTED notification. This is observed when the
   // renderer is navigated to a different page.
@@ skipping 35 matching lines @@
   // NOTIFICATION_RENDERER_PROCESS_CLOSED notification should be removed from
   // the registrar.
   std::map<content::RenderProcessHost*, int> host_contents_count_map_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewDialogController);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_