[Sync] Persist keystore key across restarts

chrome/common/pref_names.cc

 // 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.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 1572 matching lines @@
 
 // Opaque state from the invalidation subsystem that is persisted via prefs.
 // The value is base 64 encoded.
 const char kInvalidatorInvalidationState[] = "invalidator.invalidation_state";
 
 // A string that can be used to restore sync encryption infrastructure on
 // startup so that the user doesn't need to provide credentials on each start.
 const char kSyncEncryptionBootstrapToken[] =
     "sync.encryption_bootstrap_token";
 
+// Same as kSyncEncryptionBootstrapToken, but derived from the keystore key,
+// so we don't have to do a GetKey command at restart.
+const char kSyncKeystoreEncryptionBootstrapToken[] =
+    "sync.keystore_encryption_bootstrap_token";
+
 // Boolean tracking whether the user chose to specify a secondary encryption
 // passphrase.
 const char kSyncUsingSecondaryPassphrase[] = "sync.using_secondary_passphrase";
 
 // String that identifies the user logged into sync and other google services.
 const char kGoogleServicesUsername[] = "google.services.username";
 
 // Local state pref containing a string regex that restricts which accounts
 // can be used to log in to chrome (e.g. "*@google.com"). If missing or blank,
 // all accounts are allowed (no restrictions).
@@ skipping 329 matching lines @@
 const char kInManagedMode[] = "managed_mode";
 
 // Counts how many more times the 'profile on a network share' warning should be
 // shown to the user before the next silence period.
 const char kNetworkProfileWarningsLeft[] = "network_profile.warnings_left";
 // Tracks the time of the last shown warning. Used to reset
 // |network_profile.warnings_left| after a silence period.
 const char kNetworkProfileLastWarningTime[] =
     "network_profile.last_warning_time";
 }  // namespace prefs