Adding JNI binding for 'active' field in RTP encodings.

webrtc/api/java/src/org/webrtc/RtpParameters.java

Index: webrtc/api/java/src/org/webrtc/RtpParameters.java
diff --git a/webrtc/api/java/src/org/webrtc/RtpParameters.java b/webrtc/api/java/src/org/webrtc/RtpParameters.java
index 4dcdcc403b33be66ed18cc792b07a61b5e85248a..bd448994e22c1ec7ddd36137bd4afa92c95f50cd 100644
--- a/webrtc/api/java/src/org/webrtc/RtpParameters.java
+++ b/webrtc/api/java/src/org/webrtc/RtpParameters.java
@@ -18,7 +18,10 @@ import java.util.LinkedList;
  * http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface.
  */
 public class RtpParameters {
-  public static class Encoding { public Integer maxBitrateBps; }
+  public static class Encoding {
+    public boolean active = true;
+    public Integer maxBitrateBps;
+  }
 
   public final LinkedList<Encoding> encodings;