Change logging of specific tests and builds to rebaseline to debug level.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """A command to fetch new baselines from try jobs for a Rietveld issue.
 
 This command interacts with the Rietveld API to get information about try jobs
 with layout test results.
 """
 
@@ skipping 172 matching lines @@
         failure_results = layout_test_results.unexpected_mismatch_results()
         missing_results = layout_test_results.missing_results()
         return sorted(r.test_name() for r in failure_results + missing_results)
 
     @staticmethod
     def _log_test_prefix_list(test_prefix_list):
         """Logs the tests to download new baselines for."""
         if not test_prefix_list:
             _log.info('No tests to rebaseline; exiting.')
             return
-        _log.info('Tests to rebaseline:')
+        _log.debug('Tests to rebaseline:')
         for test, builds in test_prefix_list.iteritems():
-            builds_str = ', '.join(sorted('%s (%s)' % (b.builder_name, b.build_number) for b in builds))
-            _log.info('  %s: %s', test, builds_str)
+            _log.debug('  %s:', test)
+            for build in sorted(builds):
+                _log.debug('    %s', build)