urce, target, opt_importance) {
    this.source = source;
    this.target = target;
    this.importance = opt_importance;
    this.size = undefined;
  }

  /**
   * Types of size numeric information.
   *
   * @enum
   */
  const MemoryAllocatorDumpInfoType = {
    // The provided size of a MemoryAllocatorDump was less than the aggregated
    // size of its children.
    //
    // Mandatory extra args:
    //   * providedSize: The inconsistent provided size.
    //   * dependencySize: The aggregated size of