Provide a default rc_log_type of null

Change-Id: Iac33e2c28324f3312d051236e4dfb1bb4814053e
Apply overflow:auto to preview

Change-Id: I810ea6807a32832d2dc51afe154b9aadcdfdd918
Merge "Provide a default rc_log_type of null"
Merge "Apply overflow:auto to preview"