[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/native_extension_bindings_system_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/native_extension_bindings_system.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "components/crx_file/id_util.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_builder.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/permissions/permissions_data.h"
 #include "extensions/common/value_builder.h"
-#include "extensions/renderer/api_binding_test.h"
-#include "extensions/renderer/api_binding_test_util.h"
-#include "extensions/renderer/api_invocation_errors.h"
+#include "extensions/renderer/bindings/api_binding_test.h"
+#include "extensions/renderer/bindings/api_binding_test_util.h"
+#include "extensions/renderer/bindings/api_invocation_errors.h"
 #include "extensions/renderer/module_system.h"
 #include "extensions/renderer/safe_builtins.h"
 #include "extensions/renderer/script_context.h"
 #include "extensions/renderer/script_context_set.h"
 #include "extensions/renderer/string_source_map.h"
 #include "extensions/renderer/test_v8_extension_configuration.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace extensions {
 
@@ skipping 1017 matching lines @@
   v8::Local<v8::Function> add_listeners =
       FunctionFromString(context, kAddListeners);
   RunFunctionOnGlobal(add_listeners, context, 0, nullptr);
 
   // We should have no notifications for event listeners added (since the
   // mock is a strict mock, this will fail if anything was called).
   ::testing::Mock::VerifyAndClearExpectations(event_change_handler());
 }
 
 }  // namespace extensions