[webcrypto] Replace KeyAlgorithm interfaces with an Object.

public/platform/WebCryptoKeyAlgorithmParams.h

Index: public/platform/WebCryptoKeyAlgorithmParams.h
diff --git a/public/platform/WebCryptoKeyAlgorithmParams.h b/public/platform/WebCryptoKeyAlgorithmParams.h
index d71c6f086f399affab35891ac797ae1117cbb52a..903d32c146a58b3d65bb7b09d1ec13487f2b7da9 100644
--- a/public/platform/WebCryptoKeyAlgorithmParams.h
+++ b/public/platform/WebCryptoKeyAlgorithmParams.h
@@ -37,6 +37,18 @@
 
 namespace blink {
 
+// Interface used for serializing WebCryptoKeyAlgorithmParams to a javascript
+// dictionary.
+class WebCryptoKeyAlgorithmDictionary {
+public:
+    virtual ~WebCryptoKeyAlgorithmDictionary() { }
+
+    virtual void setString(const char*, const char*) = 0;
+    virtual void setUint(const char*, unsigned) = 0;
+    virtual void setAlgorithm(const char*, const WebCryptoAlgorithm&) = 0;
+    virtual void setUint8Array(const char*, const WebVector<unsigned char>&) = 0;
+};
+
 enum WebCryptoKeyAlgorithmParamsType {
     WebCryptoKeyAlgorithmParamsTypeNone,
     WebCryptoKeyAlgorithmParamsTypeHmac,
@@ -51,6 +63,8 @@ public:
     {
         return WebCryptoKeyAlgorithmParamsTypeNone;
     }
+
+    virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary*) const = 0;
 };
 
 class WebCryptoAesKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
@@ -70,6 +84,11 @@ public:
         return WebCryptoKeyAlgorithmParamsTypeAes;
     }
 
+    virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
+    {
+        dict->setUint("length", m_lengthBits);
+    }
+
 private:
     unsigned short m_lengthBits;
 };
@@ -97,6 +116,12 @@ public:
         return WebCryptoKeyAlgorithmParamsTypeHmac;
     }
 
+    virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
+    {
+        dict->setAlgorithm("hash", m_hash);
+        dict->setUint("length", m_lengthBits);
+    }
+
 private:
     WebCryptoAlgorithm m_hash;
     unsigned m_lengthBits;
@@ -131,6 +156,13 @@ public:
         return WebCryptoKeyAlgorithmParamsTypeRsaHashed;
     }
 
+    virtual void writeToDictionary(WebCryptoKeyAlgorithmDictionary* dict) const
+    {
+        dict->setAlgorithm("hash", m_hash);
+        dict->setUint("modulusLength", m_modulusLengthBits);
+        dict->setUint8Array("publicExponent", m_publicExponent);
+    }
+
 private:
     unsigned m_modulusLengthBits;
     WebVector<unsigned char> m_publicExponent;