[Sync] Add histograms for cookie jar state on Sessions commit

sync/engine/commit.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 SYNC_ENGINE_COMMIT_H_
 #define SYNC_ENGINE_COMMIT_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 33 matching lines @@
   typedef std::map<ModelType, std::unique_ptr<CommitContribution>>
       ContributionMap;
 
   Commit(ContributionMap contributions,
          const sync_pb::ClientToServerMessage& message,
          ExtensionsActivity::Records extensions_activity_buffer);
 
   // This destructor will DCHECK if CleanUp() has not been called.
   ~Commit();
 
-  static Commit* Init(
-      ModelTypeSet requested_types,
-      ModelTypeSet enabled_types,
-      size_t max_entries,
-      const std::string& account_name,
-      const std::string& cache_guid,
-      bool cookie_jar_mismatch,
-      CommitProcessor* commit_processor,
-      ExtensionsActivity* extensions_activity);
+  static Commit* Init(ModelTypeSet requested_types,
+                      ModelTypeSet enabled_types,
+                      size_t max_entries,
+                      const std::string& account_name,
+                      const std::string& cache_guid,
+                      bool cookie_jar_mismatch,
+                      bool cookie_jar_empty,
+                      CommitProcessor* commit_processor,
+                      ExtensionsActivity* extensions_activity);
 
   SyncerError PostAndProcessResponse(sessions::NudgeTracker* nudge_tracker,
                                      sessions::SyncSession* session,
                                      sessions::StatusController* status,
                                      ExtensionsActivity* extensions_activity);
 
   // Cleans up state associated with this commit.  Must be called before the
   // destructor.
   void CleanUp();
 
  private:
   ContributionMap contributions_;
 
   sync_pb::ClientToServerMessage message_;
   sync_pb::ClientToServerResponse response_;
   ExtensionsActivity::Records extensions_activity_buffer_;
 
   // Debug only flag used to indicate if it's safe to destruct the object.
   bool cleaned_up_;
 
   DISALLOW_COPY_AND_ASSIGN(Commit);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_COMMIT_H_