Files.app: Remove animation of progress bar when it reopens.

This CL adds an argument to prevent the animation when the Files.app reopens
during file transfer operations.

BUG=316540
TEST=manually

Review URL: https://codereview.chromium.org/71903002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236227 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236227