Experimental USB API

chrome/browser/extensions/api/api_resource_controller.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_BROWSER_EXTENSIONS_API_API_RESOURCE_CONTROLLER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_CONTROLLER_H_
 #pragma once
 
 #include <string>
 #include <map>
 
 #include "base/memory/linked_ptr.h"
 #include "chrome/browser/extensions/api/api_resource.h"
 
 namespace extensions {
 
 class SerialConnection;
 class Socket;
+class UsbDeviceResource;
 
 // kSrcIdKey, or "srcId," binds an APIResource to the onEvent closure that was
 // optionally passed to the APIResource's create() method. We generated it in
 // schema_generated_bindings.js; the application code is unaware of it.
 extern const char kSrcIdKey[];
 
 // APIController keeps track of a collection of APIResources and provides a
 // convenient set of methods to work with them.
 class APIResourceController {
  public:
   APIResourceController();
   virtual ~APIResourceController();
 
   // Takes ownership of api_resource.
   int AddAPIResource(APIResource* api_resource);
   bool RemoveAPIResource(int api_resource_id);
 
   // APIResourceController knows about all classes derived from APIResource.
   // This is intentional to avoid scattering potentially unsafe static_cast<>
   // operations throughout the codebase.
   //
   // Another alternative we considered and rejected was templatizing
   // APIResourceController and scattering specialized versions throughout the
   // codebase.
   Socket* GetSocket(int api_resource_id) const;
   SerialConnection* GetSerialConnection(int api_resource_id) const;
+  UsbDeviceResource* GetUsbDeviceResource(int api_resource_id) const;
 
  private:
   int next_api_resource_id_;
   typedef std::map<int, linked_ptr<APIResource> > APIResourceMap;
   APIResourceMap api_resource_map_;
 
   APIResource* GetAPIResource(APIResource::APIResourceType api_resource_type,
                               int api_resource_id) const;
   APIResource* GetAPIResource(int api_resource_id) const;
 
   int GenerateAPIResourceId();
 
   DISALLOW_COPY_AND_ASSIGN(APIResourceController);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_CONTROLLER_H_