Added DtlsCertificate, a ref counted object owning an SSLIdentity

talk/app/webrtc/peerconnectionfactory.cc

Index: talk/app/webrtc/peerconnectionfactory.cc
diff --git a/talk/app/webrtc/peerconnectionfactory.cc b/talk/app/webrtc/peerconnectionfactory.cc
index 3524af7932a4f92f60da84e552f742d1a2aaa7ac..1f3742c15044c5739ccaca6ec9948d16b16f323e 100644
--- a/talk/app/webrtc/peerconnectionfactory.cc
+++ b/talk/app/webrtc/peerconnectionfactory.cc
@@ -206,11 +206,12 @@ PeerConnectionFactory::CreatePeerConnection(
     const MediaConstraintsInterface* constraints,
     PortAllocatorFactoryInterface* allocator_factory,
     DTLSIdentityServiceInterface* dtls_identity_service,
+    rtc::scoped_refptr<DtlsCertificate> certificate,
     PeerConnectionObserver* observer) {
   DCHECK(signaling_thread_->IsCurrent());
   DCHECK(allocator_factory || default_allocator_factory_);
 
-  if (!dtls_identity_service) {
+  if (!dtls_identity_service && !certificate.get()) {
     dtls_identity_service = new DtlsIdentityService(dtls_identity_store_.get());
   }
 
@@ -225,6 +226,7 @@ PeerConnectionFactory::CreatePeerConnection(
       constraints,
       chosen_allocator_factory,
       dtls_identity_service,
+      certificate,
       observer)) {
     return NULL;
   }