Pass in custom options to Systrace agents

systrace/profile_chrome/atrace_tracing_agent_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.
 
 from profile_chrome import agents_unittest
 from profile_chrome import atrace_tracing_agent
 
 
 class AtraceAgentTest(agents_unittest.BaseAgentTest):
   def testGetCategories(self):
     categories = \
         atrace_tracing_agent.AtraceAgent.GetCategories(self.device)
     self.assertTrue(categories)
     assert 'gfx' in ' '.join(categories)
 
   def testTracing(self):
-    categories = ['gfx', 'input', 'view']

[Sami, 2016/08/26 15:53:43]

Can we keep using these categories? I'm not sure we need to change the test
setup for this patch, do we?

[washingtonp, 2016/08/26 18:50:54]

Done. Updated other profile_chrome unit tests as well.

     ring_buffer = False
     agent = atrace_tracing_agent.AtraceAgent(self.device,
-                                             categories,
                                              ring_buffer)
 
     try:
-      agent.StartAgentTracing(None, None)
+      agent.StartAgentTracing(atrace_tracing_agent.AtraceConfig(None))
     finally:
       agent.StopAgentTracing()
     result = agent.GetResults()
 
     self.assertFalse(agent.IsTracingOn())
     self.assertTrue('CPU#' in result.raw_data)