Set json content type for perf's logdog pages that display json content

TBR=jbudorick@chromium.org

Bug: 845139
Change-Id: I293032217af574b8980defb5142e2b21c1a1517f
Reviewed-on: https://chromium-review.googlesource.com/1073390Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Emily Hanley <eyaich@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#561883}

build/android/pylib/utils/logdog_helper.py

@@ -19,18 +19,20 @@ from libs.logdog import bootstrap # pylint: disable=import-error
 @decorators.NoRaiseException(default_return_value='',
                              exception_message=('Ignore this exception. '
                                                 'crbug.com/675666'))
-def text(name, data):
+def text(name, data, content_type=None):
   """Uploads text to logdog.
 
   Args:
     name: Name of the logdog stream.
     data: String with data you want to upload.
+    content_type: The optional content type of the stream. If None, a
+      default content type will be chosen.
 
   Returns:
     Link to view uploaded text in logdog viewer.
   """
   logging.info('Writing text to logdog stream, %s', name)
-  with get_logdog_client().text(name) as stream:
+  with get_logdog_client().text(name, content_type=content_type) as stream:
     stream.write(data)
     return stream.get_viewer_url()
 

tools/perf/process_perf_results.py

@@ -35,6 +35,9 @@ MACHINE_GROUP_JSON_FILE = os.path.join(
       path_util.GetChromiumSrcDir(), 'tools', 'perf', 'core',
       'perf_dashboard_machine_group_mapping.json')
 
+JSON_CONTENT_TYPE = 'application/json'
+
+
 def _GetMachineGroup(build_properties):
   machine_group = None
   if build_properties.get('perf_dashboard_machine_group', False):
@@ -169,7 +172,8 @@ def _handle_perf_logs(benchmark_directory_list, extra_links):
   logdog_file_name = _generate_unique_logdog_filename('Benchmarks_Logs')
   logdog_stream = logdog_helper.text(
       logdog_file_name, json.dumps(benchmark_logs_links, sort_keys=True,
-                                   indent=4, separators=(',', ': ')))
+                                   indent=4, separators=(',', ': ')),
+      content_type=JSON_CONTENT_TYPE)
   extra_links['Benchmarks logs'] = logdog_stream
 
 
@@ -268,7 +272,8 @@ def _handle_perf_results(
     logdog_file_name = _generate_unique_logdog_filename('Results_Dashboard_')
     logdog_stream = logdog_helper.text(logdog_file_name,
         json.dumps(logdog_dict, sort_keys=True,
-            indent=4, separators=(',', ': ')))
+                   indent=4, separators=(',', ': ')),
+        content_type=JSON_CONTENT_TYPE)
     if upload_fail:
       logdog_label += ' Upload Failure'
     extra_links[logdog_label] = logdog_stream