Hey!
To my knowledge, every gesture is already available as a toolbar button. For efficiency's sake, not every gesture has a separate corresponding toolbar button, as a mere close tab button wouldn't be good use of the limited mobile screen space. Instead, most toolbar buttons have long-press options that reveal a wide variety of options.
For example, long-pressing the tab button allows you to also close/open tabs in addition to seeing your open tabs:

I believe that is the overall best solution, and it can be further improved by introducing some of the gestures into your workflow, ultimately having everything easily accessible.
Let me know if you have any concerns about this solution.