commit 5201b739b34b7a8191dae7c6dd567cb9f1fa27a9
author Fred Quintana <fredq@google.com> Thu May 12 14:30:39 2016 -0700
committer Fred Quintana <fredq@google.com> Thu May 12 14:30:39 2016 -0700
tree 1954338dbbf7bededf85017a44319c373588e92c
parent c0156cb86828445c65a5cca152fb9e3a97ed00bb

syncbase: check for remotely unverifiable mutations

Adds a mechanism to confirm that remotely unverifiable mutations
fail locally. An example is if a user doesn't have write permission
to a collection but makes a batch that:
  add write permission
  mutates the data
  removed the write permission

Since a remote syncbase will just see the mutation but not the
addition of the write permission then it can't tell that the
mutation should actually be allowed.

MultiPart: 1/2
Change-Id: Ia07cb4a6f81beb041f6518caa4fd83a57597c72d