[fsp] Add support for opening files.

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 11 matching lines @@
     NOT_A_DIRECTORY,
     INVALID_OPERATION,
     SECURITY,
     ABORT,
     NOT_A_FILE,
     NOT_EMPTY,
     INVALID_URL,
     IO
   };
 
+  // Mode of opening a file. Used by <code>onOpenFileRequested</code>.
+  enum OpenFileMode {
+    READ,
+    WRITE
+  };
+
   // Represents metadata of a file or a directory.
   dictionary EntryMetadata {
     // True if it is a directory.
     boolean isDirectory;
 
     // Name of this entry (not full path name).
     DOMString name;
 
     // File size in bytes.
     double size;
@@ skipping 67 matching lines @@
         ProviderErrorCallback errorCallback);
 
     // Raised when metadata of a file or a directory at <code>entryPath</code>
     // is requested. The metadata should be returned with the <code>
     // successCallback</code> call. In case of an error, <code>errorCallback
     // </code> must be called.
     [maxListeners=1] static void onGetMetadataRequested(
         long fileSystemId,
         DOMString entryPath,
         MetadataCallback successCallback,
-        ErrorCallback errorCallback);
+        ProviderErrorCallback errorCallback);
 
     // Raised when contents of a directory at <code>directoryPath</code> are
     // requested. The results should 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(
         long fileSystemId,
         DOMString directoryPath,
         EntriesCallback successCallback,
-        ErrorCallback errorCallback);
+        ProviderErrorCallback errorCallback);
+
+    // Raised when opening a file at <code>filePath</code> is requested.
+    // If <code>create</code> is set to <code>true</code> and the file does not
+    // exist, then it should be created.
+    [maxListeners=1] static void onOpenFileRequested(
+        long fileSystemId,
+        DOMString filePath,
+        ProviderSuccessCallback successCallback,
+        ProviderErrorCallback errorCallback);

[kinaba, 2014/05/13 01:30:35]

Where's the <code>create</code> and open mode parameter?

[mtomasz, 2014/05/13 01:55:01]

Done.

   };
 };