telemetry: Allow page tests to be configured via constructor

tools/perf/benchmarks/benchmark_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.
 
 """For all the benchmarks that set options, test that the options are valid."""
 
 import os
 import unittest
 
 from telemetry import benchmark as benchmark_module
 from telemetry.core import browser_options
 from telemetry.core import discover
 from telemetry.unittest import progress_reporter
 
 
 def _GetPerfDir(*subdirs):
   perf_dir = os.path.dirname(os.path.dirname(__file__))
   return os.path.join(perf_dir, *subdirs)
 
 
-def _BenchmarkOptionsTestGenerator(benchmark):
+def _BenchmarkOptionsTestGenerator(benchmark_class):
   def testBenchmarkOptions(self):  # pylint: disable=W0613
     """Invalid options will raise benchmark.InvalidOptionsError."""
     options = browser_options.BrowserFinderOptions()
     parser = options.CreateParser()
+    benchmark = benchmark_class()
     benchmark.AddCommandLineArgs(parser)
     benchmark_module.AddCommandLineArgs(parser)
     benchmark.SetArgumentDefaults(parser)
   return testBenchmarkOptions
 
 
 def _AddBenchmarkOptionsTests(suite):
   # Using |index_by_class_name=True| allows returning multiple benchmarks
   # from a module.
   all_benchmarks = discover.DiscoverClasses(
       _GetPerfDir('benchmarks'), _GetPerfDir(), benchmark_module.Benchmark,
       index_by_class_name=True).values()
   for benchmark in all_benchmarks:
     if not benchmark.options:
       # No need to test benchmarks that have not defined options.
       continue
     class BenchmarkOptionsTest(unittest.TestCase):
       pass
     setattr(BenchmarkOptionsTest, benchmark.Name(),
             _BenchmarkOptionsTestGenerator(benchmark))
     suite.addTest(BenchmarkOptionsTest(benchmark.Name()))
 
 
 def load_tests(_, _2, _3):
   suite = progress_reporter.TestSuite()
   _AddBenchmarkOptionsTests(suite)
   return suite