Add option to enable ECDSA key for Java API.

talk/app/webrtc/java/jni/classreferenceholder.cc

Index: talk/app/webrtc/java/jni/classreferenceholder.cc
diff --git a/talk/app/webrtc/java/jni/classreferenceholder.cc b/talk/app/webrtc/java/jni/classreferenceholder.cc
index 520b5a7a19a1f74afc79ea26865b59209b9570af..180bb1d45c444bf03670449230a940bb95d7f3d5 100644
--- a/talk/app/webrtc/java/jni/classreferenceholder.cc
+++ b/talk/app/webrtc/java/jni/classreferenceholder.cc
@@ -101,6 +101,7 @@ ClassReferenceHolder::ClassReferenceHolder(JNIEnv* jni) {
   LoadClass(jni, "org/webrtc/PeerConnection$IceGatheringState");
   LoadClass(jni, "org/webrtc/PeerConnection$IceTransportsType");
   LoadClass(jni, "org/webrtc/PeerConnection$TcpCandidatePolicy");
+  LoadClass(jni, "org/webrtc/PeerConnection$KeyType");
   LoadClass(jni, "org/webrtc/PeerConnection$SignalingState");
   LoadClass(jni, "org/webrtc/SessionDescription");
   LoadClass(jni, "org/webrtc/SessionDescription$Type");