More polish in prep for CrOS support

tools/gpu/gpu_tools/first_paint_time_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 first_paint_time_benchmark
 import multi_page_benchmark
 
 class FirstPaintTimeBenchmarkUnitTest(
   multi_page_benchmark.MultiPageBenchmarkUnitTest):
 
-  def testBasicFunctionality(self):
+  def testFirstPaintTimeMeasurement(self):
     ps = self.CreatePageSetFromFileInUnittestDataDir('scrollable_page.html')
 
     benchmark = first_paint_time_benchmark.FirstPaintTimeBenchmark()
     rows = self.RunBenchmark(benchmark, ps)
 
     self.assertEqual(0, len(benchmark.page_failures))
 
     header = rows[0]
     results = rows[1:]
     self.assertEqual(['url', 'first_paint_secs'],
                      header)
     self.assertEqual(1, len(results))
     self.assertTrue('scrollable_page.html' in results[0][0])
+    if results[0][1] == "unsupported":
+      # This test can't run on content_shell.
+      return
     self.assertTrue(results[0][1] > 0)