[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/bindings/api_binding_bridge.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_bridge.h"
+#include "extensions/renderer/bindings/api_binding_bridge.h"
 
 #include "base/values.h"
-#include "extensions/renderer/api_binding_hooks.h"
+#include "extensions/renderer/bindings/api_binding_hooks.h"
 #include "gin/converter.h"
 #include "gin/object_template_builder.h"
 
 namespace extensions {
 
 namespace {
 
 const char kApiObjectKey[] = "extensions::bridge::api_object";
 const char kHookInterfaceKey[] = "extensions::bridge::hook_object";
 
@@ skipping 77 matching lines @@
 
   v8::Local<v8::String> extension_id =
       gin::StringToSymbol(isolate, extension_id_);
   v8::Local<v8::String> context_type =
       gin::StringToSymbol(isolate, context_type_);
   v8::Local<v8::Value> args[] = {hook_object, extension_id, context_type};
   run_js_.Run(function, context, arraysize(args), args);
 }
 
 }  // namespace extensions