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

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

Index: build/android/pylib/local/device/local_device_perf_test_run.py
diff --git a/build/android/pylib/local/device/local_device_perf_test_run.py b/build/android/pylib/local/device/local_device_perf_test_run.py
index afbd4e9c4dbffe81b93ea5ad464d7bd0e348c7e4..e0fafac7efa8acf735e7aacf1b1458effef12de5 100644
--- a/build/android/pylib/local/device/local_device_perf_test_run.py
+++ b/build/android/pylib/local/device/local_device_perf_test_run.py
@@ -425,7 +425,7 @@ class LocalDevicePerfTestRun(local_device_test_run.LocalDeviceTestRun):
     # Affinitize the tests.
     if self._test_instance.trace_output:
       assert not trace_event.trace_is_enabled(), 'Tracing already running.'
-      trace_event.trace_enable(self._test_instance.trace_output)
+      trace_event.trace_enable(self._test_instance.trace_output + '.json')
     self._SplitTestsByAffinity()
     if not self._test_buckets and not self._no_device_tests:
       raise local_device_test_run.NoTestsError()
@@ -466,6 +466,8 @@ class LocalDevicePerfTestRun(local_device_test_run.LocalDeviceTestRun):
     if self._test_instance.trace_output:
       assert trace_event.trace_is_enabled(), 'Tracing not running.'
       trace_event.trace_disable()
+      self._JsonToTrace(self._test_instance.trace_output + '.json',

[agrieve, 2016/12/20 19:27:03]

nit: shouldn't call static method via "self". Use
LocalDeviceTestRun._JsonToTrace

[rnephew (Reviews Here), 2016/12/20 19:37:56]

Done.

+                        self._test_instance.trace_output)
     return host_test_results + device_test_results
 
   # override