The Browser.getWindowForTarget command is not supported in DevTools on the Android. This is causing seemingly unnecessary complications for ChromeDriver, which needs to support (see https://bugs.chromium.org/p/chromedriver/issues/detail?id=1005) a related getWindowRect function per the W3C WebDriver spec. Our current approach (https://chromium-review.googlesource.com/c/chromium/src/+/1121335) is to call JavaScript to get corresponding window attributes, which is messy and requires maintaining two paths to the same result.