[Telemetry] Add the ability to flush the system file cache to platform.

tools/telemetry/telemetry/page/perf_tests_helper.py

Index: tools/telemetry/telemetry/page/perf_tests_helper.py
diff --git a/tools/telemetry/telemetry/page/perf_tests_helper.py b/tools/telemetry/telemetry/page/perf_tests_helper.py
deleted file mode 100644
index 285e032379f004d3acd6298462296c98503cad8d..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/page/perf_tests_helper.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# 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.
-from __future__ import absolute_import
-
-import os
-import sys
-
-def __init__():
-  path = os.path.join(os.path.dirname(__file__),
-                      '..', '..', '..', '..', 'build', 'android')
-  path = os.path.abspath(path)
-  assert os.path.exists(os.path.join(path,
-                                     'pylib', '__init__.py'))
-  if path not in sys.path:
-    sys.path.append(path)
-
-__init__()
-
-from pylib import perf_tests_helper # pylint: disable=F0401
-GeomMeanAndStdDevFromHistogram = \
-    perf_tests_helper.GeomMeanAndStdDevFromHistogram
-PrintPerfResult = \
-    perf_tests_helper.PrintPerfResult
-PrintPages = \
-    perf_tests_helper.PrintPages
-