[webcrypto] Implement PBKDF2 (blink-side)

public/platform/WebCryptoAlgorithmParams.h

Index: public/platform/WebCryptoAlgorithmParams.h
diff --git a/public/platform/WebCryptoAlgorithmParams.h b/public/platform/WebCryptoAlgorithmParams.h
index 61bacf539aab87394968c4a765b0d58ee4355d47..a3ee8c79db0e3c5b34d463776de75800428dfda7 100644
--- a/public/platform/WebCryptoAlgorithmParams.h
+++ b/public/platform/WebCryptoAlgorithmParams.h
@@ -337,6 +337,26 @@ private:
     const unsigned short m_lengthBits;
 };
 
+class WebCryptoPbkdf2Params : public WebCryptoAlgorithmParamsWithHash {
+public:
+    explicit WebCryptoPbkdf2Params(const WebCryptoAlgorithm& hash, const unsigned char* salt,
+        unsigned saltLength, unsigned long iterations)
+        : WebCryptoAlgorithmParamsWithHash(hash)
+        , m_salt(salt, saltLength)
+        , m_iterations(iterations)
+    {
+    }
+
+    virtual WebCryptoAlgorithmParamsType type() const { return WebCryptoAlgorithmParamsTypePbkdf2Params; }
+
+    const WebVector<unsigned char>& salt() const { return m_salt; }
+    unsigned long iterations() const { return m_iterations; }
+
+private:
+    const WebVector<unsigned char> m_salt;
+    const unsigned long m_iterations;
+};
+
 } // namespace blink
 
 #endif