Adding logging for failed perf dashboard uploads.

NOTRY=true
TBR=ashleymarie@chromium.org

Change-Id: I871b9fff3689356ba636c559ff86a50f8d1552e6
Reviewed-on: https://chromium-review.googlesource.com/948799Reviewed-by: Emily Hanley <eyaich@chromium.org>
Commit-Queue: Emily Hanley <eyaich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540818}

tools/perf/core/upload_results_to_perf_dashboard.py

@@ -34,6 +34,7 @@ def _GetDashboardJson(options):
   reference_build = 'reference' in options.name
   stripped_test_name = options.name.replace('.reference', '')
   results = {}
+  print 'Opening results file %s' % options.results_file
   with open(options.results_file) as f:
     results = json.load(f)
   dashboard_json = {}

tools/perf/process_perf_results.py

@@ -104,6 +104,7 @@ def _process_perf_results(output_json, configuration_name,
 
     with oauth_api.with_access_token(service_account_file) as oauth_file:
       for directory in benchmark_directory_list:
+        print 'Uploading perf results from %s benchmark' % directory
         _upload_perf_results(join(directory, 'perf_results.json'),
             directory, configuration_name, build_properties,
             oauth_file, tmpfile_dir)