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

chrome/browser/extensions/api/media_galleries/media_galleries_api.cc

Index: chrome/browser/extensions/api/media_galleries/media_galleries_api.cc
===================================================================
--- chrome/browser/extensions/api/media_galleries/media_galleries_api.cc	(revision 244236)
+++ chrome/browser/extensions/api/media_galleries/media_galleries_api.cc	(working copy)
@@ -420,6 +420,11 @@
 }
 
 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);