Add option to enable ECDSA key for Java API.

talk/app/webrtc/java/src/org/webrtc/PeerConnection.java

Index: talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
diff --git a/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java b/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
index 829f0fb297b458395f978c0773648bb80597e455..9c55be78246b1dbf8e91273afe2f93d1f2a44e52 100644
--- a/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
+++ b/talk/app/webrtc/java/src/org/webrtc/PeerConnection.java
@@ -124,11 +124,17 @@ public class PeerConnection {
   public enum RtcpMuxPolicy {
     NEGOTIATE, REQUIRE
   };
+
   /** Java version of PeerConnectionInterface.TcpCandidatePolicy */
   public enum TcpCandidatePolicy {
     ENABLED, DISABLED
   };
 
+  /** Java version of rtc::KeyType */
+  public enum KeyType {
+    RSA, ECDSA;
+  }
+
   /** Java version of PeerConnectionInterface.RTCConfiguration */
   public static class RTCConfiguration {
     public IceTransportsType iceTransportsType;
@@ -138,6 +144,7 @@ public class PeerConnection {
     public TcpCandidatePolicy tcpCandidatePolicy;
     public int audioJitterBufferMaxPackets;
     public boolean audioJitterBufferFastAccelerate;
+    public KeyType keyType;
 
     public RTCConfiguration(List<IceServer> iceServers) {
       iceTransportsType = IceTransportsType.ALL;
@@ -147,6 +154,7 @@ public class PeerConnection {
       this.iceServers = iceServers;
       audioJitterBufferMaxPackets = 50;
       audioJitterBufferFastAccelerate = false;
+      keyType = KeyType.ECDSA;
     }
   };