Specify visibility for blink File backed up FileSystemURL.

Previously blink File created from FileSystemURL is regarded as
IsUserNotVisible. Thus the selected Google Drive files are not included in the initial
selection when the file chooser reopens.

The CL adds a visibility argument to the factory method of File for
FileSystemURL, and set IsUserVisible for files selected by the file chooser.

BUG=427764
TEST=None

Review URL: https://codereview.chromium.org/690663002

git-svn-id: svn://svn.chromium.org/blink/trunk@184695 bbb929c8-8fbe-4397-9dbb-9b2b20218538