Lazily load extension API schemas

chrome/renderer/extensions/chrome_v8_context.h

 // Copyright (c) 2012 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 CHROME_RENDERER_EXTENSIONS_CHROME_V8_CONTEXT_H_
 #define CHROME_RENDERER_EXTENSIONS_CHROME_V8_CONTEXT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 80 matching lines @@
   // Call the named method of the chromeHidden object in this context.
   // The function can be a sub-property like "Port.dispatchOnMessage". Returns
   // the result of the function call in |result| if |result| is non-NULL. If the
   // named method does not exist, returns false.
   bool CallChromeHiddenMethod(
       const std::string& function_name,
       int argc,
       v8::Handle<v8::Value>* argv,
       v8::Handle<v8::Value>* result) const;
 
-  // Returns the set of extension APIs that are available to this context. If no
-  // APIs are available, returns an empty set.
-  const std::set<std::string>& GetAvailableExtensionAPIs();
-
+  // Returns the availability of the API |api_name|.
   Feature::Availability GetAvailability(const std::string& api_name);
 
   // Returns a string description of the type of context this is.
   std::string GetContextTypeDescription();
 
  private:
   // The v8 context the bindings are accessible to.
   ScopedPersistent<v8::Context> v8_context_;
 
   // The WebFrame associated with this context. This can be NULL because this
   // object can outlive is destroyed asynchronously.
   WebKit::WebFrame* web_frame_;
 
   // The extension associated with this context, or NULL if there is none. This
   // might be a hosted app in the case that this context is hosting a web URL.
   scoped_refptr<const Extension> extension_;
 
   // The type of context.
   Feature::Context context_type_;
 
   // Owns and structures the JS that is injected to set up extension bindings.
   scoped_ptr<ModuleSystem> module_system_;
 
-  // The extension APIs available to this context.
-  std::set<std::string> available_extension_apis_;
-  bool available_extension_apis_initialized_;
-
   DISALLOW_COPY_AND_ASSIGN(ChromeV8Context);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_CHROME_V8_CONTEXT_H_