Add the Sync.PassphraseType histogram.

sync/internal_api/sync_encryption_handler_impl.cc

 // Copyright 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 "sync/internal_api/sync_encryption_handler_impl.h"
 
 #include <queue>
 #include <string>
 
 #include "base/base64.h"
@@ skipping 237 matching lines @@
   WriteTransaction trans(FROM_HERE, user_share_);
   WriteNode node(&trans);
 
   if (node.InitTypeRoot(NIGORI) != BaseNode::INIT_OK)
     return;
   if (!ApplyNigoriUpdateImpl(node.GetNigoriSpecifics(),
                              trans.GetWrappedTrans())) {
     WriteEncryptionStateToNigori(&trans);
   }
 
+  UMA_HISTOGRAM_ENUMERATION("Sync.PassphraseType",
+                            GetPassphraseType(),
+                            PASSPHRASE_TYPE_SIZE);
+
   bool has_pending_keys = UnlockVault(
       trans.GetWrappedTrans()).cryptographer.has_pending_keys();
   bool is_ready = UnlockVault(
       trans.GetWrappedTrans()).cryptographer.is_ready();
   // Log the state of the cryptographer regardless of migration state.
   UMA_HISTOGRAM_BOOLEAN("Sync.CryptographerReady", is_ready);
   UMA_HISTOGRAM_BOOLEAN("Sync.CryptographerPendingKeys", has_pending_keys);
   if (IsNigoriMigratedToKeystore(node.GetNigoriSpecifics())) {
     // This account has a nigori node that has been migrated to support
     // keystore.
@@ skipping 1370 matching lines @@
 
 base::Time SyncEncryptionHandlerImpl::GetExplicitPassphraseTime() const {
   if (passphrase_type_ == FROZEN_IMPLICIT_PASSPHRASE)
     return migration_time();
   else if (passphrase_type_ == CUSTOM_PASSPHRASE)
     return custom_passphrase_time();
   return base::Time();
 }
 
 }  // namespace browser_sync