tree d96e59362f3204d653ab621c19275e7634d3dda3
parent 99a891c023a5985c20b1124256bb322224df2daa
author Dave Borowitz <dborowitz@google.com> 1541623978 -0800
committer Dave Borowitz <dborowitz@google.com> 1541624381 -0800

RevisionApi: Document that files(String) takes a nullable arg

Passing null would pass null to the underlying Files.ListFiles#setBase
method. This was also not documented as nullable, but does accept null
in the current implementation. Codify both of these with an annotation.

Given the new guarantees, we can implement RevisionApiImpl#listFiles()
in terms of #files(String).

Change-Id: I198f59412a3006e368d20a40f0894e1ff1570f13