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

content/test/gpu/gpu_tests/trace_test_expectations.py

Index: content/test/gpu/gpu_tests/trace_test_expectations.py
diff --git a/content/test/gpu/gpu_tests/trace_test_expectations.py b/content/test/gpu/gpu_tests/trace_test_expectations.py
index 24b50669e3614d6fcd3e465c687e904785c0447d..4265e2f2d3a6f85d8e37979ebfe39108cdce26d8 100644
--- a/content/test/gpu/gpu_tests/trace_test_expectations.py
+++ b/content/test/gpu/gpu_tests/trace_test_expectations.py
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from gpu_test_expectations import GpuTestExpectations
+from gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
@@ -17,7 +17,6 @@ class TraceTestExpectations(GpuTestExpectations):
 
     # Test has become increasingly flaky around 7/31/15: crbug.com/517232
     self.Fail('TraceTest.WebGLGreenTriangle', bug=517232)
-    pass
 
 class DeviceTraceTestExpectations(GpuTestExpectations):
   def SetExpectations(self):