[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/api_binding_bridge.h

-// 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.
-
-#ifndef EXTENSIONS_RENDERER_API_BINDING_BRIDGE_H_
-#define EXTENSIONS_RENDERER_API_BINDING_BRIDGE_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "extensions/renderer/api_binding_types.h"
-#include "gin/wrappable.h"
-#include "v8/include/v8.h"
-
-namespace extensions {
-class APIBindingHooks;
-
-// An object that serves as a bridge between the current JS-centric bindings and
-// the new native bindings system. This basically needs to conform to the public
-// methods of the Binding prototype in binding.js.
-class APIBindingBridge final : public gin::Wrappable<APIBindingBridge> {
- public:
-  APIBindingBridge(APIBindingHooks* hooks,
-                   v8::Local<v8::Context> context,
-                   v8::Local<v8::Value> api_object,
-                   const std::string& extension_id,
-                   const std::string& context_type,
-                   const binding::RunJSFunction& run_js);
-  ~APIBindingBridge() override;
-
-  static gin::WrapperInfo kWrapperInfo;
-
-  // gin::Wrappable:
-  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
-      v8::Isolate* isolate) final;
-
- private:
-  // Runs the given function and registers custom hooks.
-  // The function takes three arguments: an object,
-  // {
-  //   apiFunctions: <JSHookInterface> (see api_bindings_hooks.cc),
-  //   compiledApi: <the API object>
-  // }
-  // as well as a string for the extension ID and a string for the context type.
-  // This should register any hooks that the JS needs for the given API.
-  void RegisterCustomHook(v8::Isolate* isolate,
-                          v8::Local<v8::Function> function);
-
-  // The id of the extension that owns the context this belongs to.
-  std::string extension_id_;
-
-  // The type of context this belongs to.
-  std::string context_type_;
-
-  // A function to run JS safely.
-  binding::RunJSFunction run_js_;
-
-  DISALLOW_COPY_AND_ASSIGN(APIBindingBridge);
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_RENDERER_API_BINDING_BRIDGE_H_