Make perf work in adb_profile_chrome when JSON converter isn't present

When the JSON converter isn't present, the user can still manually
inspect perf recordings.

BUG=375754
TEST=tools/android/adb_profile_chrome/run_tests

Review URL: https://codereview.chromium.org/337543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277095 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/android/adb_profile_chrome/perf_controller_unittest.py b/tools/android/adb_profile_chrome/perf_controller_unittest.py
index 381e441..eac12eba6 100644
--- a/tools/android/adb_profile_chrome/perf_controller_unittest.py
+++ b/tools/android/adb_profile_chrome/perf_controller_unittest.py
@@ -7,6 +7,9 @@ import json
 
 from adb_profile_chrome import controllers_unittest
 from adb_profile_chrome import perf_controller
+from adb_profile_chrome import ui
+
+from pylib import constants
 
 
 class PerfProfilerControllerTest(controllers_unittest.BaseControllerTest):
@@ -20,6 +23,7 @@ class PerfProfilerControllerTest(controllers_unittest.BaseControllerTest):
   def testTracing(self):
     if not perf_controller.PerfProfilerController.IsSupported():
       return
+    ui.EnableTestMode()
     categories = ['cycles']
     controller = perf_controller.PerfProfilerController(self.device,
                                                         categories)
@@ -31,6 +35,14 @@ class PerfProfilerControllerTest(controllers_unittest.BaseControllerTest):
       controller.StopTracing()
 
     result = controller.PullTrace()
+    # Perf-to-JSON conversion can fail if dependencies are missing.
+    if not result:
+      perf_script_path = os.path.join(constants.DIR_SOURCE_ROOT,
+          'tools', 'telemetry', 'telemetry', 'core', 'platform', 'profiler',
+          'perf_vis', 'perf_to_tracing.py')
+      assert not os.path.exists(perf_script_path)
+      return
+
     try:
       with open(result) as f:
         json.loads(f.read())