message: Change default Grappler timeout from 5 to 20 minutes. Despite Grappler having become faster, graphs sizes have grown faster still, and the original default timeout is exceeded too frequently in some applications.
diff: @@ -114,12 +114,12 @@ FunctionDefLibrary GetFunctionDefLibraryStub(
  }
  uint64 DeadlineMicroSeconds(const RewriterConfig& cfg) {
  - const uint64 kFiveMinutesInUsec = 5 * 60 * 1000 * 1000;
  + const uint64 kTwentyMinutesInUsec = 20 * 60 * 1000 * 1000;
  if (cfg.meta_optimizer_timeout_ms() < 0) {
  return 0;
  } else {
  return cfg.meta_optimizer_timeout_ms() == 0
  - ? Env::Default()->NowMicros() + kFiveMinutesInUsec
  + ? Env::Default()->NowMicros() + kTwentyMinutesInUsec
  : Env::Default()->NowMicros() +
  cfg.meta_optimizer_timeout_ms() * 1000;
  }
  