[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_binding_hooks.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/api_binding_hooks.h"
+#include "extensions/renderer/bindings/api_binding_hooks.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/supports_user_data.h"
-#include "extensions/renderer/api_binding_hooks_delegate.h"
-#include "extensions/renderer/api_signature.h"
+#include "extensions/renderer/bindings/api_binding_hooks_delegate.h"
+#include "extensions/renderer/bindings/api_signature.h"
 #include "gin/arguments.h"
 #include "gin/handle.h"
 #include "gin/object_template_builder.h"
 #include "gin/per_context_data.h"
 #include "gin/wrappable.h"
 
 namespace extensions {
 
 namespace {
 
@@ skipping 346 matching lines @@
   if (result.IsEmpty() ||
       !gin::Converter<std::vector<v8::Local<v8::Value>>>::FromV8(
           context->GetIsolate(), result, &new_args)) {
     return false;
   }
   arguments->swap(new_args);
   return true;
 }
 
 }  // namespace extensions