Provide a basic BLASTBufferQueue implementation.

Provide a utility class which hooks the consumer end of
a BufferQueue up to BLAST. This is a trivial implementation
to enable experimentation in the client framework to begin.

Bug: 135786080
Test: Accompanying frameworks/base changes
Change-Id: I7400dc421d264a00d14e0a928c060b94bc5e5dfc