webcrypto: Add ECDSA algorithm (chromium-side)

content/child/webcrypto/jwk.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_JWK_H_
 #define CONTENT_CHILD_WEBCRYPTO_JWK_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 90 matching lines @@
   Status VerifyAlg(const std::string& expected_alg) const;
 
  private:
   scoped_ptr<base::DictionaryValue> dict_;
 };
 
 // Helper class for building the JSON for a JWK.
 class JwkWriter {
  public:
   // Initializes a writer, and sets the standard JWK members as indicated.
+  // |algorithm| is optional, and is only written if the provided |algorithm| is
+  // non-empty.
   JwkWriter(const std::string& algorithm,
             bool extractable,
             blink::WebCryptoKeyUsageMask usages,
             const std::string& kty);
 
   // Sets a string member |member_name| to |value|.
   void SetString(const std::string& member_name, const std::string& value);
 
   // Sets a bytes member |value| to |value| by base64 url-safe encoding it.
   void SetBytes(const std::string& member_name, const CryptoData& value);
@@ skipping 115 matching lines @@
 // Base64DecodeUrlSafe() above.
 CONTENT_EXPORT std::string Base64EncodeUrlSafe(const base::StringPiece& input);
 CONTENT_EXPORT std::string Base64EncodeUrlSafe(
     const std::vector<uint8_t>& input);
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_JWK_H_