使用airtest封装的chrome模拟手机浏览器H5页面操作，查找元素时，页面会闪变尺寸

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**Describe the bug**
使用airtest封装的chrome模拟手机浏览器H5页面操作，查找元素时，页面会闪变尺寸,在手机模式和网页模式之前不停切换，不停闪动页面
使用selenium chrome不会出现闪变问题

```
paste traceback here
```
from airtest.core.api import *
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from airtest_selenium.proxy import WebChrome
from selenium.webdriver.common.touch_actions import TouchActions
options = webdriver.ChromeOptions()
# 设置中文
options.add_argument('lang=zh_CN.UTF-8')
options.add_experimental_option('mobileEmulation', mobileEmulation)
driver = WebChrome(chrome_options=options)
driver.get("http://www.baidu.com")
driver.maximize_window()
time.sleep(3)
ele = driver.find_element_by_css_selector("article")

**python version:** `python3.7`

**airtest version:** `1.1.1`