Copy adb_profile_chrome to catapult

systrace/profile_chrome/perf_controller_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.
+
+import os
+import json
+
+from profile_chrome import controllers_unittest
+from profile_chrome import perf_controller
+from profile_chrome import ui
+
+
+class PerfProfilerControllerTest(controllers_unittest.BaseControllerTest):
+  def testGetCategories(self):
+    if not perf_controller.PerfProfilerController.IsSupported():
+      return
+    categories = \
+        perf_controller.PerfProfilerController.GetCategories(self.device)
+    assert 'cycles' in ' '.join(categories)
+
+  def testTracing(self):
+    if not perf_controller.PerfProfilerController.IsSupported():
+      return
+    ui.EnableTestMode()
+    categories = ['cycles']
+    controller = perf_controller.PerfProfilerController(self.device,
+                                                        categories)
+
+    interval = 1
+    try:
+      controller.StartTracing(interval)
+    finally:
+      controller.StopTracing()
+
+    result = controller.PullTrace()
+    try:
+      with open(result) as f:
+        json.loads(f.read())
+    finally:
+      os.remove(result)