Fix print preview dialog for <webview>.

chrome/browser/ui/views/constrained_window_views.cc

 // 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.
 
 #include "chrome/browser/ui/views/constrained_window_views.h"
 
 #include <algorithm>
 
+#include "chrome/browser/guest_view/web_view/web_view_guest.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 #include "ui/views/border.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 #include "ui/views/window/dialog_delegate.h"
 
 using web_modal::ModalDialogHost;
@@ skipping 94 matching lines @@
   size.SetToMin(max_size);
   UpdateModalDialogPosition(widget, dialog_host, size);
 }
 
 void UpdateBrowserModalDialogPosition(views::Widget* widget,
                                       web_modal::ModalDialogHost* dialog_host) {
   UpdateModalDialogPosition(widget, dialog_host,
                             widget->GetRootView()->GetPreferredSize());
 }
 
-views::Widget* ShowWebModalDialogViews(views::WidgetDelegate* dialog,
-                                       content::WebContents* web_contents) {
+views::Widget* ShowWebModalDialogViews(
+    views::WidgetDelegate* dialog,
+    content::WebContents* initiator_web_contents) {
+  WebViewGuest* web_view_guest = WebViewGuest::FromWebContents(
+      initiator_web_contents);
+  // For embedded WebContents, use the embedder's WebContents for constrained
+  // window.
+  content::WebContents* web_contents =
+      web_view_guest && web_view_guest->embedder_web_contents() ?
+          web_view_guest->embedder_web_contents() : initiator_web_contents;
   views::Widget* widget = CreateWebModalDialogViews(dialog, web_contents);
   web_modal::WebContentsModalDialogManager::FromWebContents(web_contents)->
       ShowModalDialog(widget->GetNativeWindow());
   return widget;
 }
 
 views::Widget* CreateWebModalDialogViews(views::WidgetDelegate* dialog,
                                          content::WebContents* web_contents) {
   DCHECK_EQ(ui::MODAL_TYPE_CHILD, dialog->GetModalType());
   web_modal::WebContentsModalDialogManager* manager =
@@ skipping 16 matching lines @@
     ChromeWebModalDialogManagerDelegate* manager = browser;
     ModalDialogHost* host = manager->GetWebContentsModalDialogHost();
     DCHECK_EQ(parent, host->GetHostView());
     ModalDialogHostObserver* dialog_host_observer =
         new BrowserModalDialogHostObserverViews(
             host, widget, kBrowserModalDialogHostObserverViewsKey);
     dialog_host_observer->OnPositionRequiresUpdate();
   }
   return widget;
 }