[dotnet] [bidi] Make input Origin as not nested (#15445)

Author: nvborisenko

dotnet/src/webdriver/BiDi/Communication/Json/Converters/InputOriginConverter.cs

@@ -33,20 +33,20 @@ public override Origin Read(ref Utf8JsonReader reader, Type typeToConvert, JsonS
 
     public override void Write(Utf8JsonWriter writer, Origin value, JsonSerializerOptions options)
     {
-        if (value is Origin.Viewport)
+        if (value is ViewportOrigin)
         {
             writer.WriteStringValue("viewport");
         }
-        else if (value is Origin.Pointer)
+        else if (value is PointerOrigin)
         {
             writer.WriteStringValue("pointer");
         }
-        else if (value is Origin.Element element)
+        else if (value is ElementOrigin element)
         {
             writer.WriteStartObject();
             writer.WriteString("type", "element");
             writer.WritePropertyName("element");
-            JsonSerializer.Serialize(writer, element.SharedReference, options);
+            JsonSerializer.Serialize(writer, element.Element, options);
             writer.WriteEndObject();
         }
     }

dotnet/src/webdriver/BiDi/Modules/Input/Origin.cs

@@ -17,18 +17,12 @@
 // under the License.
 // </copyright>
 
-using System.Text.Json.Serialization;
-
 namespace OpenQA.Selenium.BiDi.Modules.Input;
 
-public abstract record Origin
-{
-    public record Viewport() : Origin;
+public abstract record Origin;
+
+public record ViewportOrigin() : Origin;
 
-    public record Pointer() : Origin;
+public record PointerOrigin() : Origin;
 
-    public record Element([property: JsonPropertyName("element")] Script.ISharedReference SharedReference) : Origin
-    {
-        public string Type { get; } = "element";
-    }
-}
+public record ElementOrigin(Script.ISharedReference Element) : Origin;