syncbase/vsync: add the sync DAG layer.

Add the sync DAG layer to store the history of object mutations,
use it to detect conflicts, and record conflict resolutions.

Change-Id: I52967a0b2626bf2fe5324081c64ff14059d566fa
14 files changed
tree: 684c60fab560d81229e91125706475dd875de0a3
  1. v23/
  2. x/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. VERSION