[webcrypto] Add RSASSA-PKCS1-v1_5 sign and verify for NSS.

content/renderer/webcrypto/webcrypto_util.h

Index: content/renderer/webcrypto/webcrypto_util.h
diff --git a/content/renderer/webcrypto/webcrypto_util.h b/content/renderer/webcrypto/webcrypto_util.h
index 60a851a8a0e03bc37aa7cd764d159acb447bda1b..e3ea94b865ecce0d1dd84aa6c67265059fcad7b4 100644
--- a/content/renderer/webcrypto/webcrypto_util.h
+++ b/content/renderer/webcrypto/webcrypto_util.h
@@ -35,6 +35,8 @@ blink::WebArrayBuffer CreateArrayBuffer(const uint8* data, unsigned data_size);
 // In Web Crypto, this type of encoding is only used inside JWK.
 bool Base64DecodeUrlSafe(const std::string& input, std::string* output);
 
+CONTENT_EXPORT bool IsHashAlgorithm(blink::WebCryptoAlgorithmId alg_id);
+
 // Returns the "hash" param for an algorithm if it exists, otherwise returns
 // a null algorithm.
 blink::WebCryptoAlgorithm GetInnerHashAlgorithm(