Suppress Memory.CSS3D failure on MacBook Pro Retina Display.

content/test/gpu/gpu_tests/memory.py

Index: content/test/gpu/gpu_tests/memory.py
diff --git a/content/test/gpu/gpu_tests/memory.py b/content/test/gpu/gpu_tests/memory.py
index cba46faaf507295a6db611f757efacc0c6bd1920..f45d9bb686803326905a2c4ae0a6bbcb33d32110 100644
--- a/content/test/gpu/gpu_tests/memory.py
+++ b/content/test/gpu/gpu_tests/memory.py
@@ -1,6 +1,8 @@
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
+import memory_expectations
+
 from telemetry import test
 from telemetry.page import page_test
 from telemetry.core.timeline import counter
@@ -83,6 +85,9 @@ class Memory(test.Test):
   test = _MemoryValidator
   page_set = 'page_sets/memory_tests.py'
 
+  def CreateExpectations(self, page_set):
+    return memory_expectations.MemoryExpectations()
+
   def CreatePageSet(self, options):
     page_set = super(Memory, self).CreatePageSet(options)
     for page in page_set.pages: