[webcrypto] Add key generation for AES-GCM and AES-KW for NSS.

content/renderer/webcrypto/webcrypto_util.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/webcrypto/webcrypto_util.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
@@ skipping 154 matching lines @@
   return CreateAesKeyGenAlgorithm(blink::WebCryptoAlgorithmIdAesCbc,
                                   key_length_bits);
 }
 
 blink::WebCryptoAlgorithm CreateAesGcmKeyGenAlgorithm(
     unsigned short key_length_bits) {
   return CreateAesKeyGenAlgorithm(blink::WebCryptoAlgorithmIdAesGcm,
                                   key_length_bits);
 }
 
+blink::WebCryptoAlgorithm CreateAesKwKeyGenAlgorithm(

[eroman, 2013/12/20 01:28:16]

I don't think this should go in the webcrypto_util.h.

I see webcrypto_util.h as functions which are used by non-test code (for
instance NSS implementation and OpenSSL implementation, or test code + non-test
code).

If something is purely for test it should just go in the _unittest.cc file.

Otherwise we are relying on the linker to strip dead code (it probably will, but
good hygiene not to include unnecessary functions in the release build of
browser).

[padolph, 2013/12/20 02:03:00]

Done.

+    unsigned short key_length_bits) {
+  return CreateAesKeyGenAlgorithm(blink::WebCryptoAlgorithmIdAesKw,
+                                  key_length_bits);
+}
+
 }  // namespace webcrypto
 
 }  // namespace content