Android Perf tests: obtain the list of tests from the test runner.

build/android/pylib/perf/test_runner.py

 # Copyright 2013 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.
 
 """Runs perf tests.
 
 Our buildbot infrastructure requires each slave to run steps serially.
 This is sub-optimal for android, where these steps can run independently on
 multiple connected devices.
 
@@ skipping 39 matching lines @@
   "step_name_bar"
 ]
 
 Note that script_to_execute necessarily have to take at least the following
 option:
   --device: the serial number to be passed to all adb commands.
 """
 
 import collections
 import datetime
+import json
 import logging
 import os
 import pickle
 import sys
 import threading
 import time
 
 from pylib import cmd_helper
 from pylib import constants
 from pylib import forwarder
 from pylib.base import base_test_result
 from pylib.base import base_test_runner
 
 
+def OutputJsonList(json_input, json_output):
+  with file(json_input, 'r') as i:
+    all_steps = json.load(i)
+  # TODO(bulach): remove once it rolls downstream, crbug.com/378862.
+  if isinstance(all_steps, list):
+    step_names = [t[0] for t in all_steps]
+  else:
+    step_names = all_steps['steps'].keys()
+  with file(json_output, 'w') as o:
+    o.write(json.dumps(step_names))
+  return 0
+
+
 def PrintTestOutput(test_name):
   """Helper method to print the output of previously executed test_name.
 
   Args:
     test_name: name of the test that has been previously executed.
 
   Returns:
     exit code generated by the test step.
   """
   file_name = os.path.join(constants.PERF_OUTPUT_DIR, test_name)
@@ skipping 198 matching lines @@
     Returns:
       A tuple of (TestRunResults, retry).
     """
     _, result_type = self._LaunchPerfTest(test_name)
     results = base_test_result.TestRunResults()
     results.AddResult(base_test_result.BaseTestResult(test_name, result_type))
     retry = None
     if not results.DidRunPass():
       retry = test_name
     return results, retry