Support generation of EC keys using P256 curve and support ECDSA certs.

talk/app/webrtc/webrtcsessiondescriptionfactory.cc

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 294 matching lines @@
     }
     case MSG_CREATE_SESSIONDESCRIPTION_FAILED: {
       CreateSessionDescriptionMsg* param =
           static_cast<CreateSessionDescriptionMsg*>(msg->pdata);
       param->observer->OnFailure(param->error);
       delete param;
       break;
     }
     case MSG_GENERATE_IDENTITY: {
       LOG(LS_INFO) << "Generating identity.";
-      SetIdentity(rtc::SSLIdentity::Generate(DtlsIdentityStore::kIdentityName));
+      SetIdentity(rtc::SSLIdentity::Generate(DtlsIdentityStore::kIdentityName,
+                                             rtc::KT_RSA));
       break;
     }
     default:
       ASSERT(false);
       break;
   }
 }
 
 void WebRtcSessionDescriptionFactory::InternalCreateOffer(
     CreateSessionDescriptionRequest request) {
@@ skipping 122 matching lines @@
     if (create_session_description_requests_.front().type ==
         CreateSessionDescriptionRequest::kOffer) {
       InternalCreateOffer(create_session_description_requests_.front());
     } else {
       InternalCreateAnswer(create_session_description_requests_.front());
     }
     create_session_description_requests_.pop();
   }
 }
 }  // namespace webrtc