[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_type_reference_map.cc

Index: extensions/renderer/bindings/api_type_reference_map.cc
diff --git a/extensions/renderer/api_type_reference_map.cc b/extensions/renderer/bindings/api_type_reference_map.cc
similarity index 93%
rename from extensions/renderer/api_type_reference_map.cc
rename to extensions/renderer/bindings/api_type_reference_map.cc
index 33898c097eae46b577418155878fb1619e73caf3..dfe5b0641ddb4f5bce728416fd7a0f0c6ce3fcf8 100644
--- a/extensions/renderer/api_type_reference_map.cc
+++ b/extensions/renderer/bindings/api_type_reference_map.cc
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "extensions/renderer/api_type_reference_map.h"
+#include "extensions/renderer/bindings/api_type_reference_map.h"
 
-#include "extensions/renderer/api_signature.h"
-#include "extensions/renderer/argument_spec.h"
+#include "extensions/renderer/bindings/api_signature.h"
+#include "extensions/renderer/bindings/argument_spec.h"
 
 namespace extensions {