[Android] Add LogcatMonitor.

build/android/pylib/instrumentation/test_runner.py

Index: build/android/pylib/instrumentation/test_runner.py
diff --git a/build/android/pylib/instrumentation/test_runner.py b/build/android/pylib/instrumentation/test_runner.py
index 424dcb3b1a564e511a528730c1c7716b41ceffe1..cc09ca6b4d949aaf2d02774533bd7d3db1d3c122 100644
--- a/build/android/pylib/instrumentation/test_runner.py
+++ b/build/android/pylib/instrumentation/test_runner.py
@@ -51,6 +51,7 @@ class TestRunner(base_test_runner.BaseTestRunner):
     super(TestRunner, self).__init__(device, test_options.tool,
                                      test_options.cleanup_test_files)
     self._lighttp_port = constants.LIGHTTPD_RANDOM_PORT_FIRST + shard_index
+    self._logcat_monitor = None
 
     self.coverage_device_file = None
     self.coverage_dir = test_options.coverage_dir
@@ -174,9 +175,10 @@ class TestRunner(base_test_runner.BaseTestRunner):
     """
     if not self._IsPerfTest(test):
       return
-    self.device.old_interface.Adb().SendCommand(
-        'shell rm ' + TestRunner._DEVICE_PERF_OUTPUT_SEARCH_PREFIX)
-    self.device.old_interface.StartMonitoringLogcat()
+    self.device.RunShellCommand(
+        ['rm', TestRunner._DEVICE_PERF_OUTPUT_SEARCH_PREFIX])
+    self._logcat_monitor = self.device.GetLogcatMonitor()
+    self._logcat_monitor.Start()
 
   def TestTeardown(self, test, result):
     """Cleans up the test harness after running a particular test.
@@ -219,9 +221,10 @@ class TestRunner(base_test_runner.BaseTestRunner):
     raw_test_name = test.split('#')[1]
 
     # Wait and grab annotation data so we can figure out which traces to parse
-    regex = self.device.old_interface.WaitForLogMatch(
+    regex = self._logcat_monitor.WaitFor(
         re.compile(r'\*\*PERFANNOTATION\(' + raw_test_name + r'\)\:(.*)'),
         None)
+    self._logcat_monitor.Stop()
 
     # If the test is set to run on a specific device type only (IE: only
     # tablet or phone) and it is being run on the wrong device, the test