[Android] Add LogcatMonitor.

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 pylib import flag_changer
 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
     self._trace_file = None
     self._trace_finish_re = re.compile(r' Completed startup tracing to (.*)')
-    self._device.old_interface.StartMonitoringLogcat(clear=False)
 
   def __repr__(self):
     return 'Browser Startup Trace'
 
   def _SetupTracing(self):
     # TODO(lizeb): Figure out how to clean up the command-line file when
     # _TearDownTracing() is not executed in StopTracing().
     changer = flag_changer.FlagChanger(
         self._device, self._package_info.cmdline_file)
     changer.AddFlags(['--trace-startup'])
-    self._device.old_interface.CloseApplication(self._package_info.package)
+    self._device.ForceStop(self._package_info.package)
     if self._cold:
-      self._device.old_interface.EnableAdbRoot()
+      self._device.EnableRoot()
       cache_control.CacheControl(self._device).DropRamCaches()
-    self._device.old_interface.StartActivity(
-        package=self._package_info.package,
-        activity=self._package_info.activity,
-        data=self._url,
-        extras={'create_new_tab' : True})
+    self._device.StartActivity(
+        intent.Intent(
+            package=self._package_info.package,
+            activity=self._package_info.activity,
+            data=self._url,
+            extras={'create_new_tab' : True}))
 
   def _TearDownTracing(self):
     changer = flag_changer.FlagChanger(
         self._device, self._package_info.cmdline_file)
     changer.RemoveFlags(['--trace-startup'])
 
   def StartTracing(self, interval):
     self._SetupTracing()
-    self._device.old_interface.SyncLogCat()
+    self._logcat_monitor.Start()
 
   def StopTracing(self):
     try:
-      self._trace_file = self._device.old_interface.WaitForLogMatch(
-          self._trace_finish_re, None, timeout=10).group(1)
+      self._trace_file = self._logcat_monitor.WaitFor(
+          self._trace_finish_re).group(1)
     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