Add option to enable ECDSA key for Java API.

webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 403 matching lines @@
     }
     queuedRemoteCandidates = new LinkedList<IceCandidate>();
 
     PeerConnection.RTCConfiguration rtcConfig =
         new PeerConnection.RTCConfiguration(signalingParameters.iceServers);
     // TCP candidates are only useful when connecting to a server that supports
     // ICE-TCP.
     rtcConfig.tcpCandidatePolicy = PeerConnection.TcpCandidatePolicy.DISABLED;
     rtcConfig.bundlePolicy = PeerConnection.BundlePolicy.MAXBUNDLE;
     rtcConfig.rtcpMuxPolicy = PeerConnection.RtcpMuxPolicy.REQUIRE;
+    // Use ECDSA encryption.
+    rtcConfig.keyType = PeerConnection.KeyType.ECDSA;
 
     peerConnection = factory.createPeerConnection(
         rtcConfig, pcConstraints, pcObserver);
     isInitiator = false;
 
     // Set default WebRTC tracing and INFO libjingle logging.
     // NOTE: this _must_ happen while |factory| is alive!
     Logging.enableTracing(
         "logcat:",
         EnumSet.of(Logging.TraceLevel.TRACE_DEFAULT),
@@ skipping 570 matching lines @@
     public void onCreateFailure(final String error) {
       reportError("createSDP error: " + error);
     }
 
     @Override
     public void onSetFailure(final String error) {
       reportError("setSDP error: " + error);
     }
   }
 }