[fsp] Wire limiting number of opened files to FSP API.

chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h"
 
 #include <string>
 #include <vector>
 
 #include "base/debug/trace_event.h"
@@ skipping 69 matching lines @@
     SetError(FileErrorToString(base::File::FILE_ERROR_INVALID_OPERATION));
     return false;
   }
 
   // It's an error if the display name is empty.
   if (params->options.display_name.empty()) {
     SetError(FileErrorToString(base::File::FILE_ERROR_INVALID_OPERATION));
     return false;
   }
 
+  // If the opened files limit is set, then it must be larger or equal than 0.
+  if (params->options.opened_files_limit.get() &&
+      *params->options.opened_files_limit.get() < 0) {
+    SetError(FileErrorToString(base::File::FILE_ERROR_INVALID_OPERATION));
+    return false;
+  }
+
   Service* const service = Service::Get(GetProfile());
   DCHECK(service);
 
   MountOptions options;
   options.file_system_id = params->options.file_system_id;
   options.display_name = params->options.display_name;
   options.writable = params->options.writable;
+  options.opened_files_limit = params->options.opened_files_limit.get()
+                                   ? *params->options.opened_files_limit.get()
+                                   : 0;
   options.supports_notify_tag = params->options.supports_notify_tag;
 
   const base::File::Error result =
       service->MountFileSystem(extension_id(), options);
   if (result != base::File::FILE_OK) {
     SetError(FileErrorToString(result));
     return false;
   }
 
   return true;
@@ skipping 165 matching lines @@
   using api::file_system_provider_internal::OperationRequestedError::Params;
   scoped_ptr<Params> params(Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params);
 
   const base::File::Error error = ProviderErrorToFileError(params->error);
   return RejectRequest(RequestValue::CreateForOperationError(params.Pass()),
                        error);
 }
 
 }  // namespace extensions