NSS Channel ID: don't check ECC support on every socket creation.

crypto/ec_private_key.h

Index: crypto/ec_private_key.h
diff --git a/crypto/ec_private_key.h b/crypto/ec_private_key.h
index 44f754b038c9e30d45dec3545b4779f4c1759b1a..0851fe475faea414c28d75950b36ebba5ca3b0f7 100644
--- a/crypto/ec_private_key.h
+++ b/crypto/ec_private_key.h
@@ -21,6 +21,7 @@ typedef struct evp_pkey_st EVP_PKEY;
 typedef struct CERTSubjectPublicKeyInfoStr CERTSubjectPublicKeyInfo;
 typedef struct SECKEYPrivateKeyStr SECKEYPrivateKey;
 typedef struct SECKEYPublicKeyStr SECKEYPublicKey;
+typedef struct PK11SlotInfoStr PK11SlotInfo;
 #endif
 
 namespace crypto {
@@ -80,6 +81,10 @@ class CRYPTO_EXPORT ECPrivateKey {
       bool sensitive,
       SECKEYPrivateKey** key,
       SECKEYPublicKey** public_key);
+
+  // Returns a reference to the NSS slot that will be used to generate / store
+  // the private key.
+  static PK11SlotInfo* GetKeySlot();
 #endif
 
 #if defined(USE_OPENSSL)