[Android] Fix remote device log parsing.

R=klundberg@chromium.org,rnephew@chromium.org
BUG=428729

Review URL: https://codereview.chromium.org/814543002

Cr-Original-Commit-Position: refs/heads/master@{#308814}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 9be580a7692d2792439186378f470af12e19b061

android/pylib/remote/device/remote_device_gtest_run.py

@@ -49,10 +49,14 @@ class RemoteDeviceGtestRun(remote_device_test_run.RemoteDeviceTestRun):
     config_body = {'runner': runner_package}
     self._SetTestConfig(runner_type, config_body)
 
+  _INSTRUMENTATION_STREAM_LEADER = 'INSTRUMENTATION_STATUS: stream='
+
   #override
   def _ParseTestResults(self):
     logging.info('Parsing results from stdout.')
     output = self._results['results']['output'].splitlines()
+    output = (l[len(self._INSTRUMENTATION_STREAM_LEADER):] for l in output
+              if l.startswith(self._INSTRUMENTATION_STREAM_LEADER))
     results_list = self._test_instance.ParseGTestOutput(output)
     results = base_test_result.TestRunResults()
     results.AddResults(results_list)