App no longer loads on NVIDIA Shield

[moukrea]

There might be some timing related issue on Android TV, at least on NVIDIA Shield... Checks for Better xCloud injection seem to never be ready, as if they were happening before the page was fully loaded. A delay might help, but would punish other users, so we could wait for document.readyState to be "complete" before realizing our checks like so (for example)

private void ensureFullyLoaded(WebView webView) {
    webView.evaluateJavascript(
        "(document.readyState === 'complete')", 
        value -> {
            if ("true".equals(value)) {
                runChecks(webView);
            } else {
                new Handler().postDelayed(() -> ensureFullyLoaded(webView), 100);
            }
        }
    );
}

And maybe we could use this behaviour after, say, two retries so it's not the default behavior at all times (which implies to track how many times we reload the page)