Fix Async JSB unable to return class

Added note about memory leak
Added Test case to validate fix

Author: amaitland

CefSharp.Example/AsyncBoundObject.cs

@@ -46,6 +46,14 @@ public JsSerializableStruct ReturnObject(string name)
             };
         }
 
+        public JsSerializableClass ReturnClass(string name)
+        {
+            return new JsSerializableClass
+            {
+                Value = name
+            };
+        }
+
         public JsSerializableStruct[] ReturnStructArray(string name)
         {
             return new[] 

CefSharp.Example/Resources/BindingTest.html

@@ -227,7 +227,7 @@
                 });
             });
 
-            QUnit.test("Async call (Struct):", function( assert )
+            QUnit.test("Async call (return Struct):", function( assert )
             {
                 var asyncCallback = assert.async();
 
@@ -239,7 +239,7 @@
                 });
             });
 
-            QUnit.test("Async call (Class):", function (assert)
+            QUnit.test("Async call (return Class):", function (assert)
             {
                 var asyncCallback = assert.async();
 
@@ -248,7 +248,7 @@
                 {
                     const expectedResult = 'CefSharp Class Test';
 
-                    assert.equal(expectedResult, res.Value, "Class with a single field " + expectedResult);
+                    assert.equal(expectedResult, res.Value, "Class with a single property");
 
                     asyncCallback();
                 });

CefSharp/Internals/JavascriptObjectRepository.cs

@@ -266,7 +266,10 @@ public bool TryCallMethod(long objectId, string name, object[] parameters, out o
                     throw new InvalidOperationException("Could not execute method: " + name + "(" + String.Join(", ", parameters) + ") " + (missingParams > 0 ? "- Missing Parameters: " + missingParams : ""), e);
                 }
 
-                if(result != null && IsComplexType(result.GetType()))
+                //For sync binding with methods that return a complex property we create a new JavascriptObject
+                //TODO: Fix the memory leak, every call to a method that returns an object will create a new
+                //JavascriptObject and they are never released
+                if(!obj.IsAsync && result != null && IsComplexType(result.GetType()))
                 {
                     var jsObject = CreateJavascriptObject(obj.CamelCaseJavascriptNames);
                     jsObject.Value = result;