Blast: Fix missing release callbacks for shared buffers

Fixes an issue where buffers were compared only using the buffer id.
In shared buffer mode, the client will queue up the same buffer id
multiple times so we need to distinguish using the frame number as
well.

Test: https://buganizer.corp.google.com/issues/195447981#comment18
Fixes: 195447981
Change-Id: I2a2d02a0d7e67ee9577857a210cb6157683e5598