[Android] Add --no-timeout to perf sharder.

build/android/pylib/perf/test_runner.py

Index: build/android/pylib/perf/test_runner.py
diff --git a/build/android/pylib/perf/test_runner.py b/build/android/pylib/perf/test_runner.py
index f125a234b0b9c7c0b9cd514b3d6bdc93cb65e5c7..3b104c03a8c0cf8865ced85fae4fdd0c16b853b7 100644
--- a/build/android/pylib/perf/test_runner.py
+++ b/build/android/pylib/perf/test_runner.py
@@ -114,9 +114,14 @@ class TestRunner(base_test_runner.BaseTestRunner):
            (self._tests[test_name], self.device))
     logging.info('%s : %s', test_name, cmd)
     start_time = datetime.datetime.now()
+
+    timeout = 1800
+    if self._options.no_timeout:
+      timeout = None
+
     output, exit_code = pexpect.run(
         cmd, cwd=os.path.abspath(constants.DIR_SOURCE_ROOT),
-        withexitstatus=True, logfile=sys.stdout, timeout=1800,
+        withexitstatus=True, logfile=sys.stdout, timeout=timeout,
         env=os.environ)
     end_time = datetime.datetime.now()
     if exit_code is None: