Permission Prompt Test

michael@0: michael@0: michael@0: michael@0: michael@0: michael@0: Permission Prompt Test michael@0: michael@0: michael@0: michael@0: michael@0: [B2G][Helix][Browser][Wallpaper] use new File([blob], filename) to return a blob with filename when picking michael@0: michael@0: michael@0: michael@0: