[Sync] - add some debug info to track down issue 120709

chrome/browser/sync/glue/non_frontend_data_type_controller.h

Index: chrome/browser/sync/glue/non_frontend_data_type_controller.h
diff --git a/chrome/browser/sync/glue/non_frontend_data_type_controller.h b/chrome/browser/sync/glue/non_frontend_data_type_controller.h
index 39e9d6697da1a16b0782eabf3002d4a348d46b0d..feb4443c755648e328c4b2820e579f483e7848f3 100644
--- a/chrome/browser/sync/glue/non_frontend_data_type_controller.h
+++ b/chrome/browser/sync/glue/non_frontend_data_type_controller.h
@@ -149,6 +149,9 @@ class NonFrontendDataTypeController : public DataTypeController {
   // Note: this is performed on the datatype's thread.
   void StartAssociation();
 
+  // Helper method to stop associating.
+  void StopWhileAssociating();
+
   // Post the StopAssociation task to the thread the datatype lives on.
   // Note: this is performed on the frontend (UI) thread.
   // Return value: True if task posted successfully, False otherwise.
@@ -177,6 +180,10 @@ class NonFrontendDataTypeController : public DataTypeController {
   // from the UI thread.
   base::WaitableEvent datatype_stopped_;
 
+  // This is added for debugging purpose.
+  // TODO(lipalani): Remove this after debugging.
+  base::WaitableEvent start_association_called_;
+
   DISALLOW_COPY_AND_ASSIGN(NonFrontendDataTypeController);
 };