Add a snapshot of flutter/engine/src/build to our sdk

build/android/pylib/perf/perf_control_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.
+# pylint: disable=W0212
+
+import os
+import sys
+import unittest
+
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
+
+from pylib.device import device_utils
+from pylib.perf import perf_control
+
+class TestPerfControl(unittest.TestCase):
+  def setUp(self):
+    if not os.getenv('BUILDTYPE'):
+      os.environ['BUILDTYPE'] = 'Debug'
+
+    devices = device_utils.DeviceUtils.HealthyDevices()
+    self.assertGreater(len(devices), 0, 'No device attached!')
+    self._device = devices[0]
+
+  def testHighPerfMode(self):
+    perf = perf_control.PerfControl(self._device)
+    try:
+      perf.SetPerfProfilingMode()
+      cpu_info = perf.GetCpuInfo()
+      self.assertEquals(len(perf._cpu_files), len(cpu_info))
+      for _, online, governor in cpu_info:
+        self.assertTrue(online)
+        self.assertEquals('performance', governor)
+    finally:
+      perf.SetDefaultPerfMode()
+
+if __name__ == '__main__':
+  unittest.main()