Media Galleries: chrome.mediaGalleries.addUserSelectedFolder() requires a user gesture.

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>
@@ skipping 402 matching lines @@
   media_galleries::UsageCount(media_galleries::ADD_USER_SELECTED_FOLDER);
   MediaGalleriesPreferences* preferences =
       media_file_system_registry()->GetPreferences(GetProfile());
   preferences->EnsureInitialized(base::Bind(
       &MediaGalleriesAddUserSelectedFolderFunction::OnPreferencesInit,
       this));
   return true;
 }
 
 void MediaGalleriesAddUserSelectedFolderFunction::OnPreferencesInit() {
+  if (!user_gesture()) {
+    OnDirectorySelected(base::FilePath());
+    return;
+  }
+
   Profile* profile = GetProfile();
   const std::string& app_id = GetExtension()->id();
   WebContents* contents = GetWebContents(render_view_host(), profile, app_id);
   base::FilePath last_used_path =
       extensions::file_system_api::GetLastChooseEntryDirectory(
           extensions::ExtensionPrefs::Get(profile), app_id);
   SelectDirectoryDialog::Callback callback = base::Bind(
       &MediaGalleriesAddUserSelectedFolderFunction::OnDirectorySelected, this);
   scoped_refptr<SelectDirectoryDialog> select_directory_dialog =
       new SelectDirectoryDialog(contents, callback);
@@ skipping 122 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