Use the existing ra session to obtain the svn:mime-type property during svn:blame and avoid the whole ra operation on reverse blame, as we get this properties in the first revision anyway.
Use the existing ra session to obtain the svn:mime-type property during
svn:blame and avoid the whole ra operation on reverse blame, as we get
this properties in the first revision anyway.

* subversion/libsvn_client/blame.c
  (file_rev_baton): Add boolean.
  (file_rev_handler): Check mime type on first file if requested.
  (svn_client_blame5): Use ra session or wc.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1661238 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion