[Android] Log uncaught Java exceptions when running native tests.

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

Index: build/android/pylib/local/device/local_device_gtest_run.py
diff --git a/build/android/pylib/local/device/local_device_gtest_run.py b/build/android/pylib/local/device/local_device_gtest_run.py
index 8b0d1a3e45bab00492804aace72f37aaf20b6c21..2630af9e37a04cb25fd692ac3e8b8b455c9847f3 100644
--- a/build/android/pylib/local/device/local_device_gtest_run.py
+++ b/build/android/pylib/local/device/local_device_gtest_run.py
@@ -4,6 +4,7 @@
 
 import collections
 import itertools
+import logging
 import os
 import posixpath
 
@@ -311,9 +312,13 @@ class LocalDeviceGtestRun(local_device_test_run.LocalDeviceTestRun):
     @local_device_test_run.handle_shard_failures_with(
         on_failure=self._env.BlacklistDevice)
     def list_tests(dev):
-      tests = self._delegate.Run(
+      raw_test_list = self._delegate.Run(
           None, dev, flags='--gtest_list_tests', timeout=30)
-      tests = gtest_test_instance.ParseGTestListTests(tests)
+      tests = gtest_test_instance.ParseGTestListTests(raw_test_list)
+      if not tests:
+        logging.info('No tests found. Output:')
+        for l in raw_test_list:
+          logging.info('  %s', l)
       tests = self._test_instance.FilterTests(tests)
       return tests