[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_binding_test.h

Index: extensions/renderer/bindings/api_binding_test.h
diff --git a/extensions/renderer/api_binding_test.h b/extensions/renderer/bindings/api_binding_test.h
similarity index 92%
rename from extensions/renderer/api_binding_test.h
rename to extensions/renderer/bindings/api_binding_test.h
index 76e0f71626bba3a383c38f358a2311099481e05d..fe2f1934a1d0769253a301703207890034a10cca 100644
--- a/extensions/renderer/api_binding_test.h
+++ b/extensions/renderer/bindings/api_binding_test.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef EXTENSIONS_RENDERER_API_BINDING_TEST_H_
-#define EXTENSIONS_RENDERER_API_BINDING_TEST_H_
+#ifndef EXTENSIONS_RENDERER_BINDINGS_API_BINDING_TEST_H_
+#define EXTENSIONS_RENDERER_BINDINGS_API_BINDING_TEST_H_
 
 #include <memory>
 #include <vector>
@@ -69,4 +69,4 @@ class APIBindingTest : public testing::Test {
 
 }  // namespace extensions
 
-#endif  // EXTENSIONS_RENDERER_API_BINDING_TEST_H_
+#endif  // EXTENSIONS_RENDERER_BINDINGS_API_BINDING_TEST_H_