Add bindings for simulcast and RIDs in Android SDK.

This adds the bindings for rid in RtpParameters.Encoding and bindings
for send_encodings in RtpTransceiverInit to allow creating a transceiver
with multiple send encodings.

Bug: webrtc:10464
Change-Id: I4c205dc0f466768c63b7efcb3c68e93277236da0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/128960
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Commit-Queue: Amit Hilbuch <amithi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27323}
diff --git a/sdk/android/api/org/webrtc/RtpTransceiver.java b/sdk/android/api/org/webrtc/RtpTransceiver.java
index 7f875e6..64d8eb4 100644
--- a/sdk/android/api/org/webrtc/RtpTransceiver.java
+++ b/sdk/android/api/org/webrtc/RtpTransceiver.java
@@ -14,6 +14,7 @@
 import java.util.Collections;
 import java.util.List;
 import org.webrtc.MediaStreamTrack;
+import org.webrtc.RtpParameters;
 
 /**
  * Java wrapper for a C++ RtpTransceiverInterface.
@@ -71,18 +72,25 @@
   public static final class RtpTransceiverInit {
     private final RtpTransceiverDirection direction;
     private final List<String> streamIds;
+    private final List<RtpParameters.Encoding> sendEncodings;
 
     public RtpTransceiverInit() {
       this(RtpTransceiverDirection.SEND_RECV);
     }
 
     public RtpTransceiverInit(RtpTransceiverDirection direction) {
-      this(direction, Collections.emptyList());
+      this(direction, Collections.emptyList(), Collections.emptyList());
     }
 
     public RtpTransceiverInit(RtpTransceiverDirection direction, List<String> streamIds) {
+      this(direction, streamIds, Collections.emptyList());
+    }
+
+    public RtpTransceiverInit(RtpTransceiverDirection direction, List<String> streamIds,
+        List<RtpParameters.Encoding> sendEncodings) {
       this.direction = direction;
       this.streamIds = new ArrayList<String>(streamIds);
+      this.sendEncodings = new ArrayList<RtpParameters.Encoding>(sendEncodings);
     }
 
     @CalledByNative("RtpTransceiverInit")
@@ -94,6 +102,11 @@
     List<String> getStreamIds() {
       return new ArrayList<String>(this.streamIds);
     }
+
+    @CalledByNative("RtpTransceiverInit")
+    List<RtpParameters.Encoding> getSendEncodings() {
+      return new ArrayList<RtpParameters.Encoding>(this.sendEncodings);
+    }
   }
 
   private long nativeRtpTransceiver;