adb_profile_chrome: Add perf profiler

build/android/chrome_profiler/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 chrome_profiler import controllers_unittest
-from chrome_profiler import systrace_controller
+from chrome_profiler import perf_controller
 
 
-class SystraceControllerTest(controllers_unittest.BaseControllerTest):
+class PerfProfilerControllerTest(controllers_unittest.BaseControllerTest):
   def testGetCategories(self):
+    if not perf_controller.PerfProfilerController.IsSupported():
+      return
     categories = \
-        systrace_controller.SystraceController.GetCategories(self.device)
-    self.assertTrue(categories)
-    assert 'gfx' in ' '.join(categories)
+        perf_controller.PerfProfilerController.GetCategories(self.device)
+    assert 'cycles' in ' '.join(categories)
 
   def testTracing(self):
-    categories = ['gfx', 'input', 'view']
-    ring_buffer = False
-    controller = systrace_controller.SystraceController(self.device,
-                                                        categories,
-                                                        ring_buffer)
+    if not perf_controller.PerfProfilerController.IsSupported():
+      return
+    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:
-        self.assertTrue('CPU#' in f.read())
+        json.loads(f.read())
     finally:
       os.remove(result)