[Extensions Bindings] Add a bindings/ subdirectory under renderer

extensions/renderer/argument_spec_builder.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_ARGUMENT_SPEC_BUILDER_H_
-#define EXTENSIONS_RENDERER_ARGUMENT_SPEC_BUILDER_H_
-
-#include <memory>
-#include <set>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/strings/string_piece.h"
-#include "extensions/renderer/argument_spec.h"
-
-namespace extensions {
-
-// A utility class for helping construct ArgumentSpecs in tests.
-// NOTE: This is designed to be test-only. It's not worth adding to production
-// code because it's a) only a bit of syntactic sugar and b) rife with footguns.
-class ArgumentSpecBuilder {
- public:
-  explicit ArgumentSpecBuilder(ArgumentType type);
-  ArgumentSpecBuilder(ArgumentType type, base::StringPiece name);
-
-  ~ArgumentSpecBuilder();
-
-  ArgumentSpecBuilder& MakeOptional();
-  ArgumentSpecBuilder& AddProperty(base::StringPiece property_name,
-                                   std::unique_ptr<ArgumentSpec> property_spec);
-  ArgumentSpecBuilder& SetMinimum(int minimum);
-  ArgumentSpecBuilder& SetListType(std::unique_ptr<ArgumentSpec> list_type);
-  ArgumentSpecBuilder& SetRef(base::StringPiece ref);
-  ArgumentSpecBuilder& SetChoices(
-      std::vector<std::unique_ptr<ArgumentSpec>> choices);
-  ArgumentSpecBuilder& SetEnums(std::set<std::string> enum_values);
-  ArgumentSpecBuilder& SetAdditionalProperties(
-      std::unique_ptr<ArgumentSpec> additional_properties);
-  std::unique_ptr<ArgumentSpec> Build();
-
- private:
-  std::unique_ptr<ArgumentSpec> spec_;
-  ArgumentSpec::PropertiesMap properties_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArgumentSpecBuilder);
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_RENDERER_ARGUMENT_SPEC_BUILDER_H_