on CompareGMs failure, show link to most recent results on this builder

tools/tests/factory_configuration/expected/Test-Win8-ShuttleA-HD7770-x86_64-Debug-Trybot

 {
     'TargetPath': <Object>,
     '_autogen_svn_password_file': '.autogen_svn_password',
     '_autogen_svn_username_file': '.autogen_svn_username',
     '_build_targets': [
         'most',
     ],
     '_builder_name': 'Test-Win8-ShuttleA-HD7770-x86_64-Debug-Trybot',
     '_common_args': [
         '--autogen_svn_baseurl',
@@ skipping 1282 matching lines @@
                     '--is_try',
                     'True',
                     '--bench_pictures_cfg',
                     'default_msaa16',
                 ],
                 'description': 'CompareGMs',
                 'doStepIf': <Object>,
                 'env': {},
                 'exception_on_failure': <Object>,
                 'flunkOnFailure': <Object>,
-                'get_props_from_stdout': None,
+                'get_props_from_stdout': {
+                    'latest_gm_failures_url': 'View latest GM failures for this builder at: ([^
+]*)
+',
+                },
                 'haltOnFailure': <Object>,
                 'hideStepIf': <Object>,
                 'is_rebaseline_step': <Object>,
                 'is_upload_step': <Object>,
                 'timeout': <Object>,
                 'workdir': 'build\skia',
             },
         ],
         [
             <Object>,
@@ skipping 322 matching lines @@
                 'haltOnFailure': <Object>,
                 'hideStepIf': <Object>,
                 'is_rebaseline_step': <Object>,
                 'is_upload_step': <Object>,
                 'timeout': <Object>,
                 'workdir': 'build\skia',
             },
         ],
     ],
 }