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

talk/app/webrtc/dtlsidentitystore.cc

 /*
  * libjingle
  * Copyright 2015 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 47 matching lines @@
       : signaling_thread_(rtc::Thread::Current()),
         store_(store),
         key_type_(key_type) {
     store_->SignalDestroyed.connect(this, &WorkerTask::OnStoreDestroyed);
   }
 
   virtual ~WorkerTask() { DCHECK(signaling_thread_->IsCurrent()); }
 
  private:
   void GenerateIdentity_w() {
-    // TODO(hbos): Use key_type_ when torbjorng's CL has landed.
-    LOG(LS_INFO) << "Generating identity. Key type (TODO(hbos): should use): "
-                 << key_type_;
+    LOG(LS_INFO) << "Generating identity, using keytype " << key_type_;
     rtc::scoped_ptr<rtc::SSLIdentity> identity(
-        rtc::SSLIdentity::Generate(kIdentityName));
+        rtc::SSLIdentity::Generate(kIdentityName, key_type_));
 
     // Posting to |this| avoids touching |store_| on threads other than
     // |signaling_thread_| and thus avoids having to use locks.
     IdentityResultMessageData* msg = new IdentityResultMessageData(
         new IdentityResult(key_type_, identity.Pass()));
     signaling_thread_->Post(this, MSG_GENERATE_IDENTITY_RESULT, msg);
   }
 
   void OnMessage(rtc::Message* msg) override {
     switch (msg->message_id) {
@@ skipping 158 matching lines @@
         key_type == rtc::KT_RSA &&             // Only necessary for RSA.
         !request_info_[key_type].free_identity_.get() &&
         request_info_[key_type].request_observers_.size() <=
             request_info_[key_type].gen_in_progress_counts_) {
       GenerateIdentity(key_type, nullptr);
     }
   }
 }
 
 }  // namespace webrtc