Copy adb_profile_chrome to catapult

systrace/profile_chrome/ddms_controller.py

Index: systrace/profile_chrome/ddms_controller.py
diff --git a/systrace/profile_chrome/ddms_controller.py b/systrace/profile_chrome/ddms_controller.py
new file mode 100644
index 0000000000000000000000000000000000000000..3f26297f420b5f7befaf718a16b1b726a4e06887
--- /dev/null
+++ b/systrace/profile_chrome/ddms_controller.py
@@ -0,0 +1,54 @@
+# 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 profile_chrome import controllers
+from profile_chrome import util
+
+_DDMS_SAMPLING_FREQUENCY_US = 100
+
+
+class DdmsController(controllers.BaseController):
+  def __init__(self, device, package_info):
+    controllers.BaseController.__init__(self)
+    self._device = device
+    self._package = package_info.package
+    self._output_file = None
+    self._supports_sampling = self._SupportsSampling()
+
+  def __repr__(self):
+    return 'ddms profile'
+
+  def _SupportsSampling(self):
+    for line in self._device.RunShellCommand('am --help'):
+      if re.match(r'.*am profile start.*--sampling', line):
+        return True
+    return False
+
+  def StartTracing(self, _):
+    self._output_file = (
+        '/data/local/tmp/ddms-profile-%s' % util.GetTraceTimestamp())
+    cmd = 'am profile start '
+    if self._supports_sampling:
+      cmd += '--sampling %d ' % _DDMS_SAMPLING_FREQUENCY_US
+    cmd += '%s %s' % (self._package, self._output_file)
+    self._device.RunShellCommand(cmd)
+
+  def StopTracing(self):
+    self._device.RunShellCommand('am profile stop %s' % self._package)
+
+  def PullTrace(self):
+    if not self._output_file:
+      return None
+
+    # Wait for the trace file to get written.
+    time.sleep(1)
+
+    host_file = os.path.join(
+        os.path.curdir, os.path.basename(self._output_file))
+    self._device.PullFile(self._output_file, host_file)
+    return host_file