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

sync/internal_api/test/fake_sync_manager.cc

Index: sync/internal_api/test/fake_sync_manager.cc
diff --git a/sync/internal_api/test/fake_sync_manager.cc b/sync/internal_api/test/fake_sync_manager.cc
index 255ba8fd5e09314d0de13d202d0f1ce8cac08540..a0883f893935f3ea275ebaa26ba22de62ce46257 100644
--- a/sync/internal_api/test/fake_sync_manager.cc
+++ b/sync/internal_api/test/fake_sync_manager.cc
@@ -269,6 +269,7 @@ void FakeSyncManager::ClearServerData(const ClearServerDataCallback& callback) {
   callback.Run();
 }
 
-void FakeSyncManager::OnCookieJarChanged(bool account_mismatch) {}
+void FakeSyncManager::OnCookieJarChanged(bool account_mismatch,
+                                         bool empty_jar) {}
 
 }  // namespace syncer