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

chrome/common/extensions/api/file_system_provider.idl

 // 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.
 
 // Use the <code>chrome.fileSystemProvider</code> API to create file systems,
 // that can be accessible from the file manager on Chrome OS.
 [implemented_in="chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_api.h"]
 namespace fileSystemProvider {
   // Error codes used by providing extensions in response to requests as well
   // as in case of errors when calling methods of the API. For success, <code>
@@ skipping 92 matching lines @@
     // extension.
     DOMString fileSystemId;
 
     // A human-readable name for the file system. 
     DOMString displayName;
 
     // Whether the file system supports operations which may change contents
     // of the file system (such as creating, deleting or writing to files).
     boolean? writable;
 
+    // Maximum number of opened files at once. If not specified, then not
+    // limited.
+    long? openedFilesLimit;
+
     // Whether the file system supports the <code>tag</code> field for observed
     // directories. Required in order to enable the internal cache.
     [nodoc] boolean? supportsNotifyTag;
   };
 
   // Options for the <code>unmount()</code> method.
   dictionary UnmountOptions {
     // The identifier of the file system to be unmounted.
     DOMString fileSystemId;
   };
@@ skipping 373 matching lines @@
     // Raised when contents of a directory at <code>directoryPath</code> are
     // requested. The results must be returned in chunks by calling the <code>
     // successCallback</code> several times. In case of an error, <code>
     // errorCallback</code> must be called.
     [maxListeners=1] static void onReadDirectoryRequested(
         ReadDirectoryRequestedOptions options,
         EntriesCallback successCallback,
         ProviderErrorCallback errorCallback);
 
     // Raised when opening a file at <code>filePath</code> is requested. If the
-    // file does not exist, then the operation must fail.
+    // file does not exist, then the operation must fail. Maximum number of

[benwells, 2015/01/09 06:51:29]

Nit: "The maximum number of files that can be opened at once can ...."

[mtomasz, 2015/01/09 06:57:55]

Done.

+    // files opened at once can be specified with <code>MountOptions</code>.
     [maxListeners=1] static void onOpenFileRequested(
         OpenFileRequestedOptions options,
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);
 
     // Raised when opening a file previously opened with <code>openRequestId
     // </code> is requested to be closed.
     [maxListeners=1] static void onCloseFileRequested(
         CloseFileRequestedOptions options,
         ProviderSuccessCallback successCallback,
@@ skipping 82 matching lines @@
 
     // Raised when the watcher should be removed. If an error occurs, then
     // <code>errorCallback</code> must be called.
     [maxListeners=1, nodoc] static void onRemoveWatcherRequested(
       RemoveWatcherRequestedOptions options,
       ProviderSuccessCallback successCallback,
       ProviderErrorCallback errorCallback);
   };
 };