class_docstr: EGL backend for Canvas abstract class.
code: def _vispy_warmup(self):
      etime = time() + 0.25
      while time() < etime:
          sleep(0.01)
          self._vispy_canvas.set_current()
          self._vispy_canvas.app.process_events()
  
imports: from __future__ import division
  import atexit
  from time import sleep
  from ..base import BaseApplicationBackend, BaseCanvasBackend, BaseTimerBackend
  from ...util.ptime import time
  from ...None import config
label_desc: Use image node_id 4 for calling the CanvasBackend obj's underlying member method code with example usage: obj._vispy_warmup() without return types