add video encoder / decoder perf

- runs encoder / decoder for the given reference image with
  clipped image supplied to encoder for each frame
- output quality checked by comparing random pixels with the reference image
- final performance index is FPS of both encoder and decoder combined
- currently supporting only YUV420Planar and YUV420SemiPlanar
- This is still on-going work, and the next patch will change decoding part
  to use SurfaceTexture.

Change-Id: I53f219dfb91df3e5c3339487df59d811e7a8453e
4 files changed