Add logging

test/core/channel/channel_args_test.cc

@@ -153,6 +153,7 @@ struct fake_class {
 };
 
 static void* fake_pointer_arg_copy(void* arg) {
+  gpr_log(GPR_DEBUG, "fake_pointer_arg_copy");
   fake_class* fc = static_cast<fake_class*>(arg);
   fake_class* new_fc = static_cast<fake_class*>(gpr_malloc(sizeof(fake_class)));
   new_fc->foo = fc->foo;
@@ -160,6 +161,7 @@ static void* fake_pointer_arg_copy(void* arg) {
 }
 
 static void fake_pointer_arg_destroy(void* arg) {
+  gpr_log(GPR_DEBUG, "fake_pointer_arg_destroy");
   fake_class* fc = static_cast<fake_class*>(arg);
   gpr_free(fc);
 }