[telemetry] Prototype for specifying page sets using Python imports and Telemetry discovery.

tools/perf/run_measurement

 #!/usr/bin/env python
 # 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 os
 import sys
 
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, 'telemetry'))
 
 from telemetry import test_runner
-from telemetry.core import environment
 from telemetry.core import util
 from telemetry.util import bootstrap
 
 
 CROS_BOOSTRAP_DEPS_PATH = os.path.join(
     util.GetChromiumSrcDir(), 'tools', 'cros', 'bootstrap_deps')
 
 
 def main():
   if '--print-bootstrap-deps-cros' in sys.argv:
     print bootstrap.ListAllDepsPaths(CROS_BOOSTRAP_DEPS_PATH)
     return 0
 
-  base_dir = os.path.dirname(os.path.realpath(__file__))
-  test_runner.config = environment.Environment([base_dir])
-  sys.exit(test_runner.main())
+  top_level_dir = os.path.dirname(os.path.realpath(__file__))
+  environment = test_runner.Environment(
+    top_level_dir=top_level_dir,
+    test_dirs=[os.path.join(top_level_dir, 'benchmarks')],
+    page_test_dirs=[os.path.join(top_level_dir, 'measurements')],
+    page_set_dirs=[os.path.join(top_level_dir, 'page_sets')]
+  )
+  return test_runner.main(environment)
 
 
 if __name__ == '__main__':
   sys.exit(main())