message: Add minimum op time to OpMetrics
diff: @@ -26,7 +26,7 @@ message LayoutAnalysis {
  }
  // Metrics for an operation (accumulated over all occurrences).
  -// Next ID: 17
  +// Next ID: 18
  message OpMetrics {
  // HLO module id. 0 for TF ops.
  uint64 hlo_module_id = 13;
  @@ -40,6 +40,8 @@ message OpMetrics {
  uint32 occurrences = 3;
  // Total time (self + children) in picoseconds.
  uint64 time_ps = 7;
  + // Minimum time (self + children) among all occurrences.
  + uint64 min_time_ps = 17;
  // Total self time in picoseconds.
  uint64 self_time_ps = 1;
  // Total FLOPs.
  