
      }
      return new tr.ui.tracks.LetterDot(
          memoryDump, 'M', memoryColorId, memoryDump.start);
    });
  }

  /**
   * Convert a list of global memory dumps to a list of chart series (one per
   * process). Each series represents the evolution of the memory used by the
   * process over time.
   */
  function buildGlobalUsedMemoryChartSeries(globalMemoryDumps) {
    return buildMemoryChartSeries(globalMemoryDumps,
        extractGlobalMemoryDumpUsedSizes);
  }

  /**
   * Convert a list of p