[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/binding_access_checker.h

-// Copyright 2017 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_BINDING_ACCESS_CHECKER_H_
-#define EXTENSIONS_RENDERER_BINDING_ACCESS_CHECKER_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "v8/include/v8.h"
-
-namespace extensions {
-
-// A helper class to handle access-checking API features.
-class BindingAccessChecker {
- public:
-  // The callback for determining if a given API feature (specified by |name|)
-  // is available in the given context.
-  using AvailabilityCallback =
-      base::Callback<bool(v8::Local<v8::Context>, const std::string& name)>;
-
-  BindingAccessChecker(const AvailabilityCallback& is_available);
-  ~BindingAccessChecker();
-
-  // Returns true if the feature specified by |full_name| is available to the
-  // given |context|.
-  bool HasAccess(v8::Local<v8::Context> context,
-                 const std::string& full_name) const;
-
-  // Same as HasAccess(), but throws an exception in the |context| if it doesn't
-  // have access.
-  bool HasAccessOrThrowError(v8::Local<v8::Context> context,
-                             const std::string& full_name) const;
-
- private:
-  AvailabilityCallback is_available_;
-
-  DISALLOW_COPY_AND_ASSIGN(BindingAccessChecker);
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_RENDERER_BINDING_ACCESS_CHECKER_H_