Add typ boilerplate to Telemetry-based GPU tests.

content/test/gpu/gpu_tests/gpu_integration_test.py

Index: content/test/gpu/gpu_tests/gpu_integration_test.py
diff --git a/content/test/gpu/gpu_tests/gpu_integration_test.py b/content/test/gpu/gpu_tests/gpu_integration_test.py
index f9a8082644390b4c9ddcdf865c48c1cbfac4a019..9bdc7afcb3c3f585b1fc35fa4d78c83b5456718a 100644
--- a/content/test/gpu/gpu_tests/gpu_integration_test.py
+++ b/content/test/gpu/gpu_tests/gpu_integration_test.py
@@ -194,3 +194,8 @@ class GpuIntegrationTest(
 
   def setUp(self):
     self._EnsureTabIsAvailable()
+
+def LoadAllTestsInModule(module):
+  # Just delegates to serially_executed_browser_test_case to reduce the
+  # number of imports in other files.
+  return serially_executed_browser_test_case.LoadAllTestsInModule(module)