message: Add a field to record environment variables for test/benchmark execution.
diff: @@ -159,6 +159,8 @@ message MachineConfiguration {
  // Run-specific items such as arguments to the test / benchmark.
  message RunConfiguration {
  repeated string argument = 1;
  + // Environment variables used to run the test/benchmark.
  + map<string, string> env_vars = 2;
  }
  // The output of one benchmark / test run. Each run contains a list of
  