[WIP] Provided file system from NACL.

chrome/browser/chromeos/file_system_provider/operations/operation.h

 // Copyright 2014 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_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_OPERATION_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_OPERATION_H_
 
 #include <string>
 
 #include "base/files/file.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/request_manager.h"
 #include "storage/browser/fileapi/async_file_util.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
 
 namespace extensions {
 struct Event;
-class EventRouter;
 }  // namespace extensions
 
 namespace chromeos {
 namespace file_system_provider {
 namespace operations {
 
 // Base class for operation bridges between fileapi and providing extensions.
-class Operation : public RequestManager::HandlerInterface {
+template <class DestinationPolicy>
+class Operation : public RequestManager::HandlerInterface,
+                  public DestinationPolicy {
  public:
   typedef base::Callback<bool(scoped_ptr<extensions::Event> event)>
       DispatchEventImplCallback;
 
-  Operation(extensions::EventRouter* event_router,
+  Operation(typename DestinationPolicy::EventRouterType* event_router,
             const ProvidedFileSystemInfo& file_system_info);
   ~Operation() override;
 
   // RequestManager::HandlerInterface overrides.
   bool Execute(int request_id) override = 0;
   void OnSuccess(int request_id,
                  scoped_ptr<RequestValue> result,
                  bool has_more) override = 0;
   void OnError(int request_id,
                scoped_ptr<RequestValue> result,
                base::File::Error error) override = 0;
 
   // Sets custom dispatchign event implementation for tests.
   void SetDispatchEventImplForTesting(
       const DispatchEventImplCallback& callback);
 
  protected:
   // Sends an event to the providing extension. Returns false, if the providing
   // extension does not handle the |event_name| event.
   bool SendEvent(int request_id,
                  const std::string& event_name,
                  scoped_ptr<base::ListValue> event_args);
 
   ProvidedFileSystemInfo file_system_info_;
 
  private:
   DispatchEventImplCallback dispatch_event_impl_;
-  DISALLOW_COPY_AND_ASSIGN(Operation);
+  DISALLOW_COPY_AND_ASSIGN(Operation<DestinationPolicy>);
 };
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_OPERATION_H_