deps/v8/tools/profviz/composer.js
function(timestamp) {
      int_timestamp = parseInt(timestamp);
      assert(int_timestamp >= last_timestamp, "Inconsistent timestamps.");
      last_timestamp = int_timestamp;
      distortion += distortion_per_entry;
      return int_timestamp / 1000 - distortion;
    }
function(timestamp) {
      int_timestamp = parseInt(timestamp);
      assert(int_timestamp >= last_timestamp, "Inconsistent timestamps.");
      last_timestamp = int_timestamp;
      distortion += distortion_per_entry;
      return int_timestamp / 1000 - distortion;
    }
Parse functions.