Wire FailureValue in PageTestResults (try 2).

tools/perf/measurements/skpicture_printer_unittest.py

 # Copyright 2014 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 shutil
 import tempfile
 
 from measurements import skpicture_printer
 from telemetry.page import page_measurement_unittest_base
 from telemetry.unittest import options_for_unittests
@@ skipping 10 matching lines @@
     shutil.rmtree(self._options.skp_outdir)
 
   @test.Disabled('android')
   def testSkpicturePrinter(self):
     ps = self.CreatePageSetFromFileInUnittestDataDir('blank.html')
     measurement = skpicture_printer.SkpicturePrinter()
     results = self.RunMeasurement(measurement, ps, options=self._options)
 
     # Picture printing is not supported on all platforms.
     if results.failures:
-      assert 'not supported' in results.failures[0][1]
+      assert 'not supported' in results.failures[0].exc_info[1].message
       return
 
     saved_picture_count = results.FindAllPageSpecificValuesNamed(
         'saved_picture_count')
     self.assertEquals(len(saved_picture_count), 1)
     self.assertGreater(saved_picture_count[0].GetRepresentativeNumber(), 0)