Copy reviewed flags to new patch sets for identical files

If a user has already seen and reviewed a file copy the review flag
forward onto the new patch set when the file contents is identical
to the previously reviewed contents. This can save reviewers time
by allowing them to skip over files that were not modified.

Change-Id: Ieb6ca3d719446aa9145085eaacfceaa4e4071db0
1 file changed