adb_profile_chrome: Refactor into multiple modules and add tests

build/android/chrome_profiler/chrome_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 chrome_profiler import chrome_controller
+from chrome_profiler import controllers_unittest
+
+
+class ChromeControllerTest(controllers_unittest.BaseControllerTest):
+  def testGetCategories(self):
+    # Not supported on stable yet.
+    # TODO(skyostil): Remove this once category queries roll into stable.
+    if self.browser == 'stable':
+      return
+
+    categories = \
+        chrome_controller.ChromeTracingController.GetCategories(
+            self.device, self.package_info)
+
+    self.assertEquals(len(categories), 2)
+    self.assertTrue(categories[0])
+    self.assertTrue(categories[1])
+
+  def testTracing(self):
+    categories = '*'
+    ring_buffer = False
+    controller = chrome_controller.ChromeTracingController(self.device,
+                                                           self.package_info,
+                                                           categories,
+                                                           ring_buffer)
+
+    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)