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 a7b79c7b25b5581a8cf4dac26f5cd6b28130d0fd..8730af96c90035f42e767f73e913f5c849ead55d 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;
@@ -139,6 +145,7 @@ public class PeerConnection {
     public int audioJitterBufferMaxPackets;
     public boolean audioJitterBufferFastAccelerate;
     public int iceConnectionReceivingTimeout;
+    public KeyType keyType;
 
     public RTCConfiguration(List<IceServer> iceServers) {
       iceTransportsType = IceTransportsType.ALL;
@@ -149,6 +156,7 @@ public class PeerConnection {
       audioJitterBufferMaxPackets = 50;
       audioJitterBufferFastAccelerate = false;
       iceConnectionReceivingTimeout = -1;
+      keyType = KeyType.ECDSA;
     }
   };