When running locally built images, graphics_glBench fails.
The root cause seems to be autotest files.

With locally built images, crosperf sets the autotest_dir value as ~/trunk/src/third_party/autotest/files. This does not work for many graphics tests including graphics_glBench.

The workaround so far is to specify an explicit autotest_path in experiment file that has the right set of files e.g. extracted from release images. 

e.g. 
benchmark: all_graphics_perf {
  iterations: 3
}

llvm_image {
  chromeos_image: /usr/local/google/home/manojgupta/chromiumos/src/build/images/elm/latest/chromiumos_test_image.bin
  chromeos_root: /usr/local/google/home/manojgupta/chromiumos
# Does not work if autotest_path is not specified in experiment files.
  autotest_path: /tmp/elm-release/R57-9103.0.0/autotest_files
  }