tree d596d5cda2b8e665b9148492adcd201c56cf19ea
parent 65d9a51afa792226478600a205b5c764714e226c
author Daichi Hirono <hirono@google.com> 1454822623 +0900
committer Daichi Hirono <hirono@google.com> 1455070648 +0000

Check parent existance when adding/removing documents.

BUG=26212981
Change-Id: I8109e2324c027ec2182c6f521d57f3fe078a8660
(cherry picked from commit df803ec6ebd47ddc7f97ea8ef13aa359ecc7fb95)