Where to find webview-command-line for retrieving netlogs

I need to get netlogs for the Android webview used by my application. The chromium describes few steps to do so. It required userdebug build for which I am using emulator. But the commandline flags need to set using webview-command-line . The path /data/local/tmp/webview-command-line doesn't exists. There is nothing inside. /data/local/tmp folder. Can someone please guide me to how set the commandline flags. Regards