[Android] Move perf utilities into devil.

tools/profile_chrome/chrome_startup_controller.py

 # Copyright 2015 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 re
 import time
 
+from devil.android.perf import cache_control
+from devil.android.sdk import intent
 from pylib import flag_changer
-from pylib.device import intent
-from pylib.perf import cache_control
 
 from profile_chrome import controllers
 
 class ChromeStartupTracingController(controllers.BaseController):
   def __init__(self, device, package_info, cold, url):
     self._device = device
     self._package_info = package_info
     self._cold = cold
     self._logcat_monitor = self._device.GetLogcatMonitor()
     self._url = url
@@ skipping 43 matching lines @@
     finally:
       self._TearDownTracing()
 
   def PullTrace(self):
     # Wait a bit for the browser to finish writing the trace file.
     time.sleep(3)
     trace_file = self._trace_file.replace('/storage/emulated/0/', '/sdcard/')
     host_file = os.path.join(os.path.curdir, os.path.basename(trace_file))
     self._device.PullFile(trace_file, host_file)
     return host_file