Expose computation of md5 content checksums for files via a file manager private API.

chrome/common/extensions/api/file_manager_private.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.
 
 // fileManagerPrivate API.
 // This is a private API used by the file browser of ChromeOS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_manager/file_manager_private_api_functions.h"]
 namespace fileManagerPrivate {
 // Type of the mounted volume.
@@ skipping 545 matching lines @@
 // |runningProfile| ID of the profile that runs the application instance.
 // |showingProfile| ID of the profile that shows the application window.
 callback GetProfilesCallback = void(ProfileInfo[] profiles,
                                     DOMString runningProfile,
                                     DOMString displayProfile);
 
 // |entryUrl| URL of an entry in a normal file system.
 callback ResolveEntriesCallback =
     void([instanceOf=FileEntry] object[] entries);
 
+// |checksum| Result checksum.
+callback ComputeChecksumCallback = void(DOMString checksum);
+
 interface Functions {
   // Logout the current user for navigating to the re-authentication screen for
   // the Google account.
   static void logoutUserForReauthentication();
 
   // Cancels file selection.
   static void cancelDialog();
 
   // Executes file browser task over selected files.
   // |taskId| The unique identifier of task to execute.
@@ skipping 236 matching lines @@
   // Obtains a list of profiles that are logged-in.
   static void getProfiles(GetProfilesCallback callback);
 
   // Moves the window to other user's desktop.
   static void visitDesktop(DOMString profileId,
                            optional SimpleCallback callback);
 
   // Opens inspector window.
   // |type| InspectionType which specifies how to open inspector.
   static void openInspector(InspectionType type);
+
+  // Computes an MD5 checksum for the given file.
+  // |fileURL| The URL of the file to checksum.
+  // |callback|
+  static void computeChecksum(DOMString fileURL,
+                              ComputeChecksumCallback callback);
 };
 
 interface Events {
   static void onMountCompleted(MountCompletedEvent event);
 
   static void onFileTransfersUpdated(FileTransferStatus event);
 
   static void onCopyProgress(long copyId, CopyProgressStatus status);
 
   static void onDirectoryChanged(FileWatchEvent event);
 
   static void onPreferencesChanged();
 
   static void onDriveConnectionStatusChanged();
 
   static void onDeviceChanged(DeviceEvent event);
 
   static void onDriveSyncError(DriveSyncErrorEvent event);
 };
 };