WebCrypto: properly normalize optional numeric parameters.

Source/bindings/v8/Dictionary.cpp

Index: Source/bindings/v8/Dictionary.cpp
diff --git a/Source/bindings/v8/Dictionary.cpp b/Source/bindings/v8/Dictionary.cpp
index 199197bca029d90b9e2a7c49847e237a1026d3a8..6b29255755998d90c5cfa72516566cd6fe871f3e 100644
--- a/Source/bindings/v8/Dictionary.cpp
+++ b/Source/bindings/v8/Dictionary.cpp
@@ -142,12 +142,15 @@ bool Dictionary::get(const String& key, int32_t& value) const
     return true;
 }
 
-bool Dictionary::get(const String& key, double& value) const
+bool Dictionary::get(const String& key, double& value, bool& hasValue) const
 {
     v8::Local<v8::Value> v8Value;
-    if (!getKey(key, v8Value))
+    if (!getKey(key, v8Value)) {
+        hasValue = false;
         return false;
+    }
 
+    hasValue = true;
     v8::Local<v8::Number> v8Number = v8Value->ToNumber();
     if (v8Number.IsEmpty())
         return false;
@@ -155,6 +158,12 @@ bool Dictionary::get(const String& key, double& value) const
     return true;
 }
 
+bool Dictionary::get(const String& key, double& value) const
+{
+    bool unused;
+    return get(key, value, unused);
+}
+
 bool Dictionary::get(const String& key, String& value) const
 {
     v8::Local<v8::Value> v8Value;