Add end to end test for Media galleries scan API.

chrome/browser/extensions/api/media_galleries/media_galleries_api.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.
 
 // Implements the Chrome Extensions Media Galleries API.
 
 #include "chrome/browser/extensions/api/media_galleries/media_galleries_api.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
+#include "base/callback.h"
 #include "base/lazy_instance.h"
 #include "base/platform_file.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/file_system/file_system_api.h"
 #include "chrome/browser/extensions/blob_reader.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
@@ skipping 666 matching lines @@
     // We don't fire a scan progress error here, as it would be unintuitive.
     return false;
   }
   if (!user_gesture())
     return false;
 
   return Setup(GetProfile(), &error_, base::Bind(
       &MediaGalleriesAddScanResultsFunction::OnPreferencesInit, this));
 }
 
+MediaGalleriesScanResultDialogController*
+MediaGalleriesAddScanResultsFunction::MakeDialog(
+    content::WebContents* web_contents,
+    const extensions::Extension& extension,
+    const base::Closure& on_finish) {
+  // Controller will delete itself.
+  return new MediaGalleriesScanResultDialogController(web_contents, extension,
+                                                      on_finish);
+}
+
 void MediaGalleriesAddScanResultsFunction::OnPreferencesInit() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   const Extension* extension = GetExtension();
   MediaGalleriesPreferences* preferences =
       media_file_system_registry()->GetPreferences(GetProfile());
   if (MediaGalleriesScanResultDialogController::ScanResultCountForExtension(
           preferences, extension) == 0) {
     GetAndReturnGalleries();
     return;
   }
 
   WebContents* contents =
       GetWebContents(render_view_host(), GetProfile(), extension->id());
   if (!contents) {
     SendResponse(false);
     return;
   }
 
-  // Controller will delete itself.
   base::Closure cb = base::Bind(
       &MediaGalleriesAddScanResultsFunction::GetAndReturnGalleries, this);
-  new MediaGalleriesScanResultDialogController(contents, *extension, cb);
+  MakeDialog(contents, *extension, cb);
 }
 
 void MediaGalleriesAddScanResultsFunction::GetAndReturnGalleries() {
   if (!render_view_host()) {
     ReturnGalleries(std::vector<MediaFileSystemInfo>());
     return;
   }
   MediaFileSystemRegistry* registry = media_file_system_registry();
   DCHECK(registry->GetPreferences(GetProfile())->IsInitialized());
   registry->GetMediaFileSystemsForExtension(
@@ skipping 65 matching lines @@
   if (mime_type_sniffed)
     metadata.mime_type = mime_type;
 
   // TODO(tommycli): Kick off SafeMediaMetadataParser if |mime_type_only| false.
 
   SetResult(metadata.ToValue().release());
   SendResponse(true);
 }
 
 }  // namespace extensions