Joint chroma search
Joint chroma search

high-latency, cpu=0:
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0817 | -0.4672 | -0.6651 |   0.1043 | 0.0968 |  0.1063 |    -0.1847

low-latency, cpu=0:
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0860 | -0.7110 | -0.7393 |   0.1018 | 0.0946 |  0.1800 |    -0.1537

low-latency, cpu=4:
  PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
0.0097 | -0.8022 | -0.7514 |  -0.0115 | 0.0621 | -0.0092 |    -0.3804

Change-Id: I5c2eced295598771c7a74ec15a5f0eb84d872cc9

smarter/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,smarter/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom