[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 0108115134ea1d92148d0417af371e0fb763a27f..d6b84e945e67d5caa9e59def103c91951fc959d5 100644
--- a/public/platform/WebCryptoAlgorithmParams.h
+++ b/public/platform/WebCryptoAlgorithmParams.h
@@ -360,6 +360,26 @@ private:
     const WebVector<unsigned char> m_info;
 };
 
+class WebCryptoPbkdf2Params : public WebCryptoAlgorithmParamsWithHash {
+public:
+    WebCryptoPbkdf2Params(const WebCryptoAlgorithm& hash, const unsigned char* salt,
+        unsigned saltLength, unsigned 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 iterations() const { return m_iterations; }
+
+private:
+    const WebVector<unsigned char> m_salt;
+    const unsigned m_iterations;
+};
+
 } // namespace blink
 
 #endif