webcrypto: Add ECDSA algorithm (chromium-side)

content/child/webcrypto/webcrypto_util.cc

Index: content/child/webcrypto/webcrypto_util.cc
diff --git a/content/child/webcrypto/webcrypto_util.cc b/content/child/webcrypto/webcrypto_util.cc
index 410acdda7383eb3e7a2e275b323bcc1365e10d2c..5bdc6b9991d142fb8e0c95f75f36a8a0eaa4e835 100644
--- a/content/child/webcrypto/webcrypto_util.cc
+++ b/content/child/webcrypto/webcrypto_util.cc
@@ -137,6 +137,13 @@ blink::WebCryptoAlgorithm CreateRsaHashedImportAlgorithm(
       id, new blink::WebCryptoRsaHashedImportParams(CreateAlgorithm(hash_id)));
 }
 
+blink::WebCryptoAlgorithm CreateEcImportAlgorithm(
+    blink::WebCryptoAlgorithmId id,
+    blink::WebCryptoNamedCurve named_curve) {
+  return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
+      id, new blink::WebCryptoEcKeyImportParams(named_curve));
+}
+
 bool ContainsKeyUsages(blink::WebCryptoKeyUsageMask a,
                        blink::WebCryptoKeyUsageMask b) {
   return (a & b) == b;