Denote a symbolic link in side-by-side viewer When code reviewing a symbolic link it is hard to tell from a regular file that just happens to have the same content. Make the symbolic link more obvious by showing "File Type: Symbolic Link" at the top of a symbolic link content. Bug: issue 622 Change-Id: I4cfbae0523e05320773938e8dc871eb8bf592977 Signed-off-by: Shawn O. Pearce <sop@google.com>