Add support to Google Update wrappers for the "automatic updates only" group policy setting.

chrome/browser/google/google_update_win.h

 // Copyright (c) 2012 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_GOOGLE_GOOGLE_UPDATE_WIN_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_UPDATE_WIN_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
@@ skipping 38 matching lines @@
   // Google Update OnDemand COM class reported an error during a check for
   // update (or while upgrading).
   GOOGLE_UPDATE_ONDEMAND_CLASS_REPORTED_ERROR,
   // A call to GetResults failed.
   GOOGLE_UPDATE_GET_RESULT_CALL_FAILED,
   // A call to GetVersionInfo failed.
   GOOGLE_UPDATE_GET_VERSION_INFO_FAILED,
   // An error occurred while upgrading (or while checking for update).
   // Check the Google Update log in %TEMP% for more details.
   GOOGLE_UPDATE_ERROR_UPDATING,
-  // Updates can not be downloaded because the administrator has disabled them.
+  // Updates can not be downloaded because the administrator has disabled all
+  // types of updating.
   GOOGLE_UPDATE_DISABLED_BY_POLICY,
+  // Updates can not be downloaded because the administrator has disabled
+  // manual (on-demand) updates.  Automatic background updates are allowed.
+  GOOGLE_UPDATE_DISABLED_BY_POLICY_AUTO_ONLY,
 };
 
 // The GoogleUpdateStatusListener interface is used by components to receive
 // notifications about the results of an Google Update operation.
 class GoogleUpdateStatusListener {
  public:
   // This function is called when Google Update has finished its operation and
   // wants to notify us about the results. |results| represents what the end
   // state is, |error_code| represents what error occurred, |error_message| is a
   // string version of the same (might be blank) and |version| specifies what
@@ skipping 63 matching lines @@
   // Otherwise, this will be blank.
   string16 version_available_;
 
   // The listener who is interested in finding out the result of the operation.
   GoogleUpdateStatusListener* listener_;
 
   DISALLOW_COPY_AND_ASSIGN(GoogleUpdate);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_UPDATE_WIN_H_