VEX-3245: Buffer Progress UI While Paused (#7)

Add support for onBufferProgress prop on Android to get buffer data even when the player is paused.

Video.js

@@ -233,6 +233,12 @@ export default class Video extends Component {
     }
   };
 
+  _onBufferProgress = (event) => {
+    if (this.props.onBufferProgress) {
+      this.props.onBufferProgress(event.nativeEvent);
+    }
+  };
+
   _onGetLicense = (event) => {
     if (this.props.drm && this.props.drm.getLicense instanceof Function) {
       const data = event.nativeEvent;
@@ -311,6 +317,7 @@ export default class Video extends Component {
       onVideoSeek: this._onSeek,
       onVideoEnd: this._onEnd,
       onVideoBuffer: this._onBuffer,
+      onVideoBufferProgress: this._onBufferProgress,
       onVideoBandwidthUpdate: this._onBandwidthUpdate,
       onTimedMetadata: this._onTimedMetadata,
       onVideoAudioBecomingNoisy: this._onAudioBecomingNoisy,