[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/argument_spec_unittest.cc

Index: extensions/renderer/bindings/argument_spec_unittest.cc
diff --git a/extensions/renderer/argument_spec_unittest.cc b/extensions/renderer/bindings/argument_spec_unittest.cc
similarity index 99%
rename from extensions/renderer/argument_spec_unittest.cc
rename to extensions/renderer/bindings/argument_spec_unittest.cc
index 60110a799a4a2b280224de9d4c0f52047264ccfd..85a0a707577df617a3a62cdd2a9b3d0cd30936e2 100644
--- a/extensions/renderer/argument_spec_unittest.cc
+++ b/extensions/renderer/bindings/argument_spec_unittest.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "extensions/renderer/argument_spec.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
-#include "extensions/renderer/api_binding_test_util.h"
-#include "extensions/renderer/api_invocation_errors.h"
-#include "extensions/renderer/api_type_reference_map.h"
+#include "extensions/renderer/bindings/api_binding_test_util.h"
+#include "extensions/renderer/bindings/api_invocation_errors.h"
+#include "extensions/renderer/bindings/api_type_reference_map.h"
+#include "extensions/renderer/bindings/argument_spec.h"
 #include "gin/converter.h"
 #include "gin/public/isolate_holder.h"
 #include "gin/test/v8_test.h"