google-keep-draw-short-cut.js

// F12 & paster to use Ctrl+Z & Ctrl+Y for google keep draw 
function KeyPress(e) {
      var evtobj = window.event? event : e
      if (evtobj.keyCode == 90 && evtobj.ctrlKey) {
          document.querySelector("#canvas-parent > div.above-ink-canvas > div > div > div.ink-toolbar-end > div:nth-child(1) > button").click()
      }

      if (evtobj.keyCode == 89 && evtobj.ctrlKey) {
          document.querySelector("#canvas-parent > div.above-ink-canvas > div > div > div.ink-toolbar-end > div:nth-child(2) > button").click()
      }
}

document.onkeydown = KeyPress;