Handle the case where the v8 scriptable object has a property defined with value undefined.

ppapi/tests/blink_deprecated_test_plugin.cc

Index: ppapi/tests/blink_deprecated_test_plugin.cc
diff --git a/ppapi/tests/blink_deprecated_test_plugin.cc b/ppapi/tests/blink_deprecated_test_plugin.cc
index b11a37df4334e913beba0ef39947a713664de45b..93fc86531ec89ea602b4e97c276a645759372bda 100644
--- a/ppapi/tests/blink_deprecated_test_plugin.cc
+++ b/ppapi/tests/blink_deprecated_test_plugin.cc
@@ -54,6 +54,18 @@ class InstanceSO : public pp::deprecated::ScriptableObject {
     return ScriptableObject::Call(method_name, args, exception);
   }
 
+  bool HasProperty(const pp::Var& name, pp::Var* exception) {
+    if (name.AsString() == "testprop")
+      return true;
+    return false;
+  }
+
+  pp::Var GetProperty(const pp::Var& name, pp::Var* exception) {
+    if (!(name.AsString() == "testprop"))
+      *exception = pp::Var("Property does not exist on ScriptableObject");
+    return pp::Var();
+  }
+
  private:
   using MethodMap =
       std::map<std::string,