rebaseline.py: add bug-filing URL to error message

tools/rebaseline.py

 #!/usr/bin/python
 
 '''
 Copyright 2012 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 '''
 
 '''
@@ skipping 103 matching lines @@
     going, or exit the program right away."""
     # Get traceback information about the most recently raised exception.
     exc_info = sys.exc_info()
 
     if self._keep_going_on_failure:
       print >> sys.stderr, ('WARNING: swallowing exception %s' %
                             repr(exc_info[1]))
       self._failures_encountered.append(exc_info)
     else:
       print >> sys.stderr, (
-          'Halting at first exception; to keep going, re-run ' +
-          'with the --keep-going-on-failure option set.')
+          '\nHalting at first exception.\n' +
+          'Please file a bug to epoger@google.com at ' +
+          'https://code.google.com/p/skia/issues/entry, containing the ' +
+          'command you ran and the following stack trace.\n\n' +
+          'Afterwards, you can re-run with the --keep-going-on-failure ' +
+          'option set.\n')
       raise exc_info[1], None, exc_info[2]
 
   def ReportAllFailures(self):
     if self._failures_encountered:
       print >> sys.stderr, ('Encountered %d failures (see above).' %
                             len(self._failures_encountered))
       sys.exit(1)
 
 
 # Object that rebaselines a JSON expectations file (not individual image files).
@@ skipping 281 matching lines @@
     except:
       exception_handler.RaiseExceptionOrContinue()
   else:
     try:
       raise _InternalException('expectations_json_file %s not found' %
                                expectations_json_file)
     except:
       exception_handler.RaiseExceptionOrContinue()
 
 exception_handler.ReportAllFailures()