OnlineEvent Bridge is not thread safe and does not support Embedded WebView Use Case

OnlineEvents bridge isn't thread safe, so we need a bridge that is threadsafe. This one doesn't work well with ICS, but we should probably have it anyway.

https://github.com/phonegap/cordova-android/tree/building_bridges

We plan on making this the default bridge on the next major version of Cordova, and this breaks the API for embedding webviews. That said, it takes only one line for Crosswalk to support this new bridge mode. This is why we're making a Cordova-Android 6.0.x