[Android] Generate html file for test runner trace instead of json.

build/android/pylib/local/device/local_device_test_run.py

 # Copyright 2014 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.
 
 import fnmatch
 import imp
 import logging
 import posixpath
 import signal
 import thread
 import threading
 
 from devil.utils import signal_handler
 from pylib import valgrind_tools
 from pylib.base import base_test_result
 from pylib.base import test_run
 from pylib.base import test_collection
 from pylib.local.device import local_device_environment
+from tracing_build import trace2html
 
 
 _SIGTERM_TEST_LOG = (
   '  Suite execution terminated, probably due to swarming timeout.\n'
   '  Your test may not have run.')
 
 
 def IncrementalInstall(device, apk_helper, installer_script):
   """Performs an incremental install.
 
@@ skipping 167 matching lines @@
 
   def _GetTests(self):
     raise NotImplementedError
 
   def _RunTest(self, device, test):
     raise NotImplementedError
 
   def _ShouldShard(self):
     raise NotImplementedError
 
+  @staticmethod
+  def _JsonToTrace(json_path, html_path):
+    # First argument is call site.
+    cmd = [__file__, json_path, '--title', 'Android Test Runner Trace',
+           '--output', html_path]
+    trace2html.Main(cmd)
+
 
 class NoTestsError(Exception):
   """Error for when no tests are found."""