tree c7cdff134661856186ba710b5c83b843c2616834
parent 09242acc5196d43175aa5e692f4266288095743e
author Ali Ghassemi <aghassemi@google.com> 1448956581 -0800
committer Ali Ghassemi <aghassemi@google.com> 1448956581 -0800

syncslides: Emulating BlobRef ( to some extend )

This allows us to sync data structures faster and load
the image bytes on demand after UI loads.

This also allows us to simply sync the thumbnail of advertised
presentations using Syncbase instead of making an Rpc.

-Moving all bytes to another general purpose blobs table.
-All blobs for a deck are prefixed with deckId.
-There is a special syncgroup of the thumbnail of a deck
 that only includes a single blob row. This syncgroup is
 joined by everyone who discovers the presentation to get
 the thumbnail.

Change-Id: Ib821f1e81ec25c4b08e49246bb34f12508870b22