[webcrypto] Add deriveBits key_op to JWK import/export.

content/child/webcrypto/webcrypto_util.cc

 // 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.
 
 #include "content/child/webcrypto/webcrypto_util.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "content/child/webcrypto/status.h"
@@ skipping 49 matching lines @@
 
 struct JwkToWebCryptoUsage {
   const char* const jwk_key_op;
   const blink::WebCryptoKeyUsage webcrypto_usage;
 };
 
 const JwkToWebCryptoUsage kJwkWebCryptoUsageMap[] = {
     {"encrypt", blink::WebCryptoKeyUsageEncrypt},
     {"decrypt", blink::WebCryptoKeyUsageDecrypt},
     {"deriveKey", blink::WebCryptoKeyUsageDeriveKey},
-    // TODO(padolph): Add 'deriveBits' once supported by Blink.
+    {"deriveBits", blink::WebCryptoKeyUsageDeriveBits},
     {"sign", blink::WebCryptoKeyUsageSign},
     {"unwrapKey", blink::WebCryptoKeyUsageUnwrapKey},
     {"verify", blink::WebCryptoKeyUsageVerify},
     {"wrapKey", blink::WebCryptoKeyUsageWrapKey}};
 
 // Modifies the input usage_mask by according to the key_op value.
 bool JwkKeyOpToWebCryptoUsage(const std::string& key_op,
                               blink::WebCryptoKeyUsageMask* usage_mask) {
   for (size_t i = 0; i < arraysize(kJwkWebCryptoUsageMap); ++i) {
     if (kJwkWebCryptoUsageMap[i].jwk_key_op == key_op) {
@@ skipping 94 matching lines @@
           algorithm.id(), keylen_bytes * 8);
       return true;
     default:
       return false;
   }
 }
 
 }  // namespace webcrypto
 
 }  // namespace content