Reset the FrameNumber for dropped frame in async mode

In Async, reset the framenumber of frames dropped by the BufferQueue.
This allows the client to dequeue and use this frame before the other
queued frames which may be with the MDP.

CRs-fixed: 448606
Change-Id: Icaabf77b55a7275dc98ba1fdfba89508feb92145
GC triggering performance optimizations

Copy the correct starting heap size at process init.
Interfaces to set GC/managed heap parameters.

Change-Id: Ifbc6194310c61c05206f1d425ba5b4ebf8658141