WebCrypto: Add ECDSA algorithm (Blink side).

public/platform/WebCryptoKeyAlgorithmParams.h

Index: public/platform/WebCryptoKeyAlgorithmParams.h
diff --git a/public/platform/WebCryptoKeyAlgorithmParams.h b/public/platform/WebCryptoKeyAlgorithmParams.h
index 903d32c146a58b3d65bb7b09d1ec13487f2b7da9..3450c02e427ae1c2eaeaaf52f5372e84a12a8c7a 100644
--- a/public/platform/WebCryptoKeyAlgorithmParams.h
+++ b/public/platform/WebCryptoKeyAlgorithmParams.h
@@ -53,7 +53,8 @@ enum WebCryptoKeyAlgorithmParamsType {
     WebCryptoKeyAlgorithmParamsTypeNone,
     WebCryptoKeyAlgorithmParamsTypeHmac,
     WebCryptoKeyAlgorithmParamsTypeAes,
-    WebCryptoKeyAlgorithmParamsTypeRsaHashed
+    WebCryptoKeyAlgorithmParamsTypeRsaHashed,
+    WebCryptoKeyAlgorithmParamsTypeEc,
 };
 
 class WebCryptoKeyAlgorithmParams {
@@ -169,6 +170,42 @@ private:
     WebCryptoAlgorithm m_hash;
 };
 
+class WebCryptoEcKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
+public:
+    explicit WebCryptoEcKeyAlgorithmParams(WebCryptoNamedCurve namedCurve)
+        : m_namedCurve(namedCurve)
+    {
+    }
+
+    WebCryptoNamedCurve namedCurve() const
+    {
+        return m_namedCurve;
+    }
+
+    virtual WebCryptoKeyAlgorithmParamsType type() const
+    {
+        return WebCryptoKeyAlgorithmParamsTypeEc;
+    }
+
+    virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
+    {
+        switch (m_namedCurve) {
+        case WebCryptoNamedCurveP256:
+            dict->setString("namedCurve", "P-256");
+            break;
+        case WebCryptoNamedCurveP384:
+            dict->setString("namedCurve", "P-384");
+            break;
+        case WebCryptoNamedCurveP521:
+            dict->setString("namedCurve", "P-521");
+            break;
+        }
+    }
+
+private:
+    const WebCryptoNamedCurve m_namedCurve;
+};
+
 } // namespace blink
 
 #endif