More polish in prep for CrOS support

tools/gpu/gpu_tools/multi_page_benchmark_unittest.py

+# 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 unittest
+
+import multi_page_benchmark
+
+class BenchThatFails(multi_page_benchmark.MultiPageBenchmark):
+  def MeasurePage(self, page, tab):
+    raise multi_page_benchmark.MeasurementFailure("Whoops")
+
+class MultiPageBenchmarkTest(multi_page_benchmark.MultiPageBenchmarkUnitTest):
+  def testFailure(self):
+    ps = self.CreatePageSetFromFileInUnittestDataDir('non_scrollable_page.html')
+    benchmark = BenchThatFails()
+    rows = self.RunBenchmark(benchmark, ps)
+    self.assertEquals(1, len(benchmark.page_failures))