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
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