docs: function HeapEntry(heapDump, leafStackFrame, size) {
      this.heapDump = heapDump;
  
      // The leaf stack frame of the associated backtrace (e.g. drawQuad for the
      // drawQuad <- draw <- MessageLoop::RunTask backtrace). If undefined, the
      // heap entry is a sum over all backtraces. On the other hand, an empty
      // backtrace is represented by the root stack frame, which has an undefined
      // name.
      this.leafStackFrame = leafStackFrame;
  
      this.size = size;
    }