Files.app: Add the error view to progress item.

Currently new progress center does not have the view of errors.
This CL adds the view of errors to the progress item.

BUG=277432
TEST=manually

Review URL: https://codereview.chromium.org/25861002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226986 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226986