Sign CertificateVerify messages on a background thread.

net/ssl/ssl_platform_key_nss.cc

Index: net/ssl/ssl_platform_key_nss.cc
diff --git a/net/ssl/openssl_platform_key_nss.cc b/net/ssl/ssl_platform_key_nss.cc
similarity index 60%
rename from net/ssl/openssl_platform_key_nss.cc
rename to net/ssl/ssl_platform_key_nss.cc
index a9471e4452301d3e8d3b5eb86bd1b569d2476759..ed56932fa0d2a85e0a62f133629f8346be743664 100644
--- a/net/ssl/openssl_platform_key_nss.cc
+++ b/net/ssl/ssl_platform_key_nss.cc
@@ -3,12 +3,14 @@
 // found in the LICENSE file.
 
 #include "base/logging.h"
-#include "net/ssl/openssl_platform_key.h"
+#include "net/ssl/ssl_platform_key.h"
+#include "net/ssl/ssl_private_key.h"
 
 namespace net {
 
-crypto::ScopedEVP_PKEY FetchClientCertPrivateKey(
-    const X509Certificate* certificate) {
+scoped_ptr<SSLPrivateKey> FetchClientCertPrivateKey(
+    const X509Certificate* certificate,
+    const scoped_refptr<base::TaskRunner>& task_runner) {
   // TODO(davidben): Implement client auth for NSS. https://crbug.com/479036
   NOTIMPLEMENTED();
   return nullptr;