Swiftshader changes for HAL_PIXEL_FORMAT_YCbCr_420_888 Bug: 26822256 Change-Id: I2d974e1170847786369797d8e9b10ba4ad3663e0 Reviewed-on: https://swiftshader-review.googlesource.com/4660 Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Greg Hartman <ghartman@google.com>