[Sync] - Upload the callstacks for errors so that the line number of error is in callstack.

chrome/browser/sync/glue/data_type_controller.h

Index: chrome/browser/sync/glue/data_type_controller.h
diff --git a/chrome/browser/sync/glue/data_type_controller.h b/chrome/browser/sync/glue/data_type_controller.h
index 3d451b2dfc2811fd1ae2b41d12a9a03a0a4c384c..4eb3e25868922b777e6f4dfb76438f9762e0320e 100644
--- a/chrome/browser/sync/glue/data_type_controller.h
+++ b/chrome/browser/sync/glue/data_type_controller.h
@@ -97,6 +97,12 @@ class DataTypeController
   // Current state of the data type controller.
   virtual State state() const = 0;
 
+  // Partial implementation of DataTypeErrorHandler.
+  virtual SyncError CreateAndUploadError(
+      const tracked_objects::Location& location,
+      const std::string& message,
+      syncable::ModelType type);
+
  protected:
   // Handles the reporting of unrecoverable error. It records stuff in
   // UMA and reports to breakpad.