Add a presubmit script and pylintrc for content/test/gpu

content/test/gpu/gpu_tests/test_expectations_unittest.py

Index: content/test/gpu/gpu_tests/test_expectations_unittest.py
diff --git a/content/test/gpu/gpu_tests/test_expectations_unittest.py b/content/test/gpu/gpu_tests/test_expectations_unittest.py
index 6faf0dcc04182a9b6363c3d7cc83e89b204941bc..ad5acda558938e55b90882fa34cbe367259a5e7c 100644
--- a/content/test/gpu/gpu_tests/test_expectations_unittest.py
+++ b/content/test/gpu/gpu_tests/test_expectations_unittest.py
@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 import unittest
 
-import test_expectations
+from gpu_tests import test_expectations
 
 from telemetry.page import page as page_module
 from telemetry.story import story_set
@@ -29,9 +29,6 @@ class StubBrowser(object):
   def supports_system_info(self):
     return False
 
-  def GetSystemInfo(self):
-    return self.system_info
-
 
 class SampleExpectationSubclass(test_expectations.Expectation):
   def __init__(self, expectation, pattern, conditions=None, bug=None):