The C++ class names don't match what the classes do, so rename
ISurfaceTexture to IGraphicBufferProducer, and SurfaceTexture to
GLConsumer.
Bug 7736700
Change-Id: Ia03e468888025b5cae3c0ee1995434515dbea387
BufferItemConsumer allows for acquiring BufferQueue's BufferItems,
which contain all the data and metadata the BufferQueue has for a
given graphics buffer.
This consumer is useful when direct access to the native buffer_handles
is needed by the client.
Also includes a minor cleanup of CpuConsumer's use of 'virtual'.
Bug: 6243944
Change-Id: If7dc4192b15ac499555f1eda42a85140f2434795