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

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index d23a7ed9b16d99f619d057be75c1d4b1ca674bab..1ff7f5dd749aec250400f9018d6e56e8d0905fd9 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -1026,9 +1026,11 @@ void SyncManagerImpl::ClearServerData(const ClearServerDataCallback& callback) {
   scheduler_->ScheduleClearServerData(params);
 }
 
-void SyncManagerImpl::OnCookieJarChanged(bool account_mismatch) {
+void SyncManagerImpl::OnCookieJarChanged(bool account_mismatch,
+                                         bool empty_jar) {
   DCHECK(thread_checker_.CalledOnValidThread());
   session_context_->set_cookie_jar_mismatch(account_mismatch);
+  session_context_->set_cookie_jar_empty(empty_jar);
 }
 
 }  // namespace syncer