Add typ boilerplate to Telemetry-based GPU tests.

content/test/gpu/gpu_tests/path_util.py

Index: content/test/gpu/gpu_tests/path_util.py
diff --git a/content/test/gpu/gpu_tests/path_util.py b/content/test/gpu/gpu_tests/path_util.py
index b9681e07041713507367479c0f73bf577010135e..70d1fcd1a0a0e60a96448bc1f377eeafb9a068ca 100644
--- a/content/test/gpu/gpu_tests/path_util.py
+++ b/content/test/gpu/gpu_tests/path_util.py
@@ -38,3 +38,8 @@ def SetupTelemetryPaths():
       chromium_src_dir, 'third_party', 'catapult', 'common', 'py_utils')
   if py_utils_path not in sys.path:
     sys.path.append(py_utils_path)
+
+  pylint_path = os.path.join(
+      chromium_src_dir, 'third_party', 'pylint')
+  if pylint_path not in sys.path:
+    sys.path.append(pylint_path)