Add end to end test for Media galleries scan API.

chrome/browser/ui/views/extensions/media_galleries_scan_result_dialog_views.cc

 // Copyright 2014 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/extensions/media_galleries_scan_result_dialog_views.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 "content/public/browser/web_contents.h"
@@ skipping 304 matching lines @@
 
   if (context_menu_runner_->RunMenuAt(
           GetWidget(), NULL, gfx::Rect(point.x(), point.y(), 0, 0),
           views::MenuItemView::TOPLEFT, source_type,
           views::MenuRunner::HAS_MNEMONICS | views::MenuRunner::CONTEXT_MENU) ==
       views::MenuRunner::MENU_DELETED) {
     return;
   }
 }
 
+void MediaGalleriesScanResultDialogViews::AcceptDialogForTesting() {
+  accepted_ = true;
+
+  web_modal::WebContentsModalDialogManager* web_contents_modal_dialog_manager =
+      web_modal::WebContentsModalDialogManager::FromWebContents(
+          controller_->web_contents());
+  DCHECK(web_contents_modal_dialog_manager);
+  web_modal::WebContentsModalDialogManager::TestApi(
+      web_contents_modal_dialog_manager).CloseAllDialogs();
+}
+
 // MediaGalleriesScanResultDialogViewsController -------------------------------
 
 // static
 MediaGalleriesScanResultDialog* MediaGalleriesScanResultDialog::Create(
     MediaGalleriesScanResultDialogController* controller) {
   return new MediaGalleriesScanResultDialogViews(controller);
 }