[fsp] Let extensions decide about the file system id.

chrome/browser/chromeos/extensions/file_system_provider/provider_function.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_EXTENSIONS_FILE_SYSTEM_PROVIDER_PROVIDER_FUNCTION_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_SYSTEM_PROVIDER_PROVIDER_FUNCTION_H_
+
 #include <string>
 
 #include "base/files/file.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/common/extensions/api/file_system_provider.h"
 
 namespace base {
 class DictionaryValue;
 }  // namespace base
 
 namespace chromeos {
 namespace file_system_provider {
 
 class RequestManager;
 class RequestValue;
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 namespace extensions {
 
 // Error names from
 // http://www.w3.org/TR/file-system-api/#errors-and-exceptions
 extern const char kNotFoundErrorName[];
 extern const char kSecurityErrorName[];
 
 // Error messages.
 extern const char kEmptyNameErrorMessage[];
+extern const char kEmptyIdErrorMessage[];
 extern const char kMountFailedErrorMessage[];
 extern const char kUnmountFailedErrorMessage[];
 extern const char kResponseFailedErrorMessage[];
 
 // Creates a dictionary, which looks like a DOMError. The returned dictionary
 // will be converted to a real DOMError object in
 // file_system_provier_custom_bindings.js.
 base::DictionaryValue* CreateError(const std::string& name,
                                    const std::string& message);
 
@@ skipping 38 matching lines @@
   // Sets an error message in case of a failure.
   void SetErrorResponse(const std::string& name, const std::string& message);
 
   int request_id_;
   chromeos::file_system_provider::RequestManager* request_manager_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_SYSTEM_PROVIDER_PROVIDER_FUNCTION_H_