CCodec: Episode III --- Video Encoding

- Implement createInputSurface()
- Handle RGB format in C2AllocatorGralloc
- Define picture type mask and handle it
- Process onWorkDone_nb() callbacks in a separate thread
- Add an unofficial option to take component name directly in screenrecord
- Force array mode for allocation latency; to be removed once proper
  buffer pool is in place.

Test: setprop debug.stagefright.ccodec yes
Test: stagefright -S -N c2.google.avc.decoder /sdcard/a.mp4
Change-Id: Iba225350e2eb2a1e6f4d45a02628d0f7ba188df3