how to expansion the clickable area of the extension icon in the chromium fork

i has a chromium fork of version 88, and i changed the size of extension icon from 2828 to 6868, but now i have met a problem, the clickable area was always appeared below the bottom half of the extension icon,

and the size of hover area of the mouse was still 2828, how i make the whole area size of 6868 being clickable ?

file: chrome\browser\ui\layout_constants.cc:78
  case TOOLBAR_BUTTON_HEIGHT:
      // return touch_ui ? 48 : 28;
      return touch_ui ? 48 : 68;