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Passes the BufferItem for the queued buffer to the onFrameAvailable
callback so the consumer can track the BufferQueue's contents. Also
adds an onFrameReplaced callback, which is necessary if the consumer
wants to do anything more than simple queue length tracking.

Bug: 18111837
Change-Id: If9d07229c9b586c668e5f99074e9b63b0468feb0

- nsecs_t printed with PRId64
- int64_t/uint64_t print issues
- some size_t printing issues.
- missing argument to BQ_LOGV

Change-Id: I493f2b578e801dc38c44f8c536faa45266720402

Adds a StreamSplitter class, that takes one IGraphicBufferConsumer
interface and multiple IGraphicBufferProducer interfaces and
implements a one-to-many broadcast of GraphicBuffers (while managing
fences correctly).

Change-Id: I38ecdf3e311ac521bc781c30dde0cc382a4376a3