[Extensions Bindings] Add APIBindingsSystem

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 62 matching lines @@
 
     std::vector<std::unique_ptr<HandlerCallback>> context_callbacks;
   };
 
   // Handles a call an API method with the given |name| and matches the
   // arguments against |signature|.
   void HandleCall(const std::string& name,
                   const APISignature* signature,
                   gin::Arguments* args);
 
+  // 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 callback to use when an API is invoked with valid arguments.
   APIMethodCallback method_callback_;
 
   // 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_