[Extensions Bindings] Add enum support

extensions/renderer/api_binding.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_H_
 #define EXTENSIONS_RENDERER_API_BINDING_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 77 matching lines @@
 
   // The root name of the API, e.g. "tabs" for chrome.tabs.
   std::string api_name_;
 
   // A map from method name to expected signature.
   std::map<std::string, std::unique_ptr<APISignature>> signatures_;
 
   // The names of all events associated with this API.
   std::vector<std::string> event_names_;
 
+  // The pair for enum entry is <original, js-ified>. JS enum entries use
+  // SCREAMING_STYLE (whereas our API enums are just inconsistent).
+  using EnumEntry = std::pair<std::string, std::string>;
+  // A map of <name, values> for the enums on this API.
+  std::map<std::string, std::vector<EnumEntry>> enums_;
+
   // The callback to use when an API is invoked with valid arguments.
   APIMethodCallback method_callback_;
 
   // The registered hooks for this API.
   std::unique_ptr<APIBindingHooks> binding_hooks_;
 
   // The reference map for all known types; required to outlive this object.
   const ArgumentSpec::RefMap* type_refs_;
 
   base::WeakPtrFactory<APIBinding> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(APIBinding);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_BINDING_H_