[fsp] Add documentation for the File System Provider 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.
 [platforms=("chromeos"),
  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. For
@@ skipping 110 matching lines @@
   // Callback to handle an error raised from the browser.
   [nocompile] callback ErrorCallback = void([instanceOf=DOMError] object error);
 
   // Success callback for the <code>onGetMetadataRequested</code> event.
   callback MetadataCallback = void(EntryMetadata metadata);
 
   // Success callback for the <code>onReadDirectoryRequested</code> event. If
   // more entries will be returned, then <code>hasMore</code> must be true, and
   // it has to be called again with additional entries. If no more entries are
   // available, then <code>hasMore</code> must be set to false.
-  callback EntriesCallback = void(ResourceEntry[] entries, bool hasMore);
+  callback EntriesCallback = void(EntryMetadata[] entries, boolean hasMore);
 
   // Success callback for the <code>onReadFileRequested</code> event. If more
   // data will be returned, then <code>hasMore</code> must be true, and it
   // has to be called again with additional entries. If no more data is
   // available, then <code>hasMore</code> must be set to false.
-  callback FileDataCallback = void(ArrayBuffer data, bool hasMore);
+  callback FileDataCallback = void(ArrayBuffer data, boolean hasMore);
 
   interface Functions {
     // Mounts a file system with the given <code>fileSystemId</code> and <code>
     // displayName</code>. <code>displayName</code> will be shown in the left
     // panel of Files.app. <code>displayName</code> can contain any characters
     // including '/', but cannot be an empty string. <code>displayName</code>
     // should be descriptive but doesn't have to be unique. Duplicate display
     // names are uniquified by adding suffix like "(1)" in the Files app UI.
     //
     // If a file system with the passed <code>fileSystemId</code> is already
@@ skipping 63 matching lines @@
     // </code>. The results should be returned in chunks by calling <code>
     // successCallback</code> several times. In case of an error, <code>
     // errorCallback</code> must be called.
     [maxListeners=1] static void onReadFileRequested(
         ReadFileRequestedOptions options,
         FileDataCallback successCallback,
         ProviderErrorCallback errorCallback);
   };
 };