Hello Riddle Ling – I have looked at using a WebView for WebRTC video chats, and believe that this is not possible at the present time. Below are two web links that you should review:
1. Android WebView at Google Play
https://play.google.com/store/apps/details?id=com.google.android.webview&hl=en
2. Android WebView at Developer Chrome
https://developer.chrome.com/multidevice/webview/overview
You will see, in reviewing these pages, that the current WebView for Android requires Version 5.0. I can find nothing to state that it is WebRTC enabled.
The Android L Developer Preview seems to contain a version of WebView (V36.0.0.0) that is WebRTC enabled, but not ready for general release. I find the explanation at both of these links a bit wanting. Perhaps another forum member can provide more helpful information.
Regards