[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_signature.cc

Index: extensions/renderer/bindings/api_signature.cc
diff --git a/extensions/renderer/api_signature.cc b/extensions/renderer/bindings/api_signature.cc
similarity index 98%
rename from extensions/renderer/api_signature.cc
rename to extensions/renderer/bindings/api_signature.cc
index c07705fba852e7655269de065c96896698c5fc35..5c2eb5f918d7415342a53b1dfe91c867397efc45 100644
--- a/extensions/renderer/api_signature.cc
+++ b/extensions/renderer/bindings/api_signature.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "extensions/renderer/api_signature.h"
+#include "extensions/renderer/bindings/api_signature.h"
 
 #include <algorithm>
 
@@ -11,8 +11,8 @@
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "content/public/child/v8_value_converter.h"
-#include "extensions/renderer/api_invocation_errors.h"
-#include "extensions/renderer/argument_spec.h"
+#include "extensions/renderer/bindings/api_invocation_errors.h"
+#include "extensions/renderer/bindings/argument_spec.h"
 #include "gin/arguments.h"
 
 namespace extensions {