xwalk webview proguard config

参考：https://www.jianshu.com/p/f3b3e91575ee

-keepattributes

Annotation

-keepattributes JavascriptInterface

-keepclassmembers class * {
@org.xwalk.core.JavascriptInterface <methods>;
}

-keepclassmembers class com.mybacc.xwalkvideoplayer.JSVideoObj {
public *;
}