Pass in custom options to Systrace agents

systrace/profile_chrome/perf_tracing_agent_unittest.py

Index: systrace/profile_chrome/perf_tracing_agent_unittest.py
diff --git a/systrace/profile_chrome/perf_tracing_agent_unittest.py b/systrace/profile_chrome/perf_tracing_agent_unittest.py
index 1367e9b759f3aacb0eb1fbdc56cf6eb7f9a3bb75..cd90b3691744ee7cd8982fc8279fe830d689f252 100644
--- a/systrace/profile_chrome/perf_tracing_agent_unittest.py
+++ b/systrace/profile_chrome/perf_tracing_agent_unittest.py
@@ -21,12 +21,11 @@ class PerfProfilerAgentTest(agents_unittest.BaseAgentTest):
     if not perf_tracing_agent.PerfProfilerAgent.IsSupported():
       return
     ui.EnableTestMode()
-    categories = ['cycles']
-    agent = perf_tracing_agent.PerfProfilerAgent(self.device,
-                                                 categories)
+    categories = 'cycles'
+    agent = perf_tracing_agent.PerfProfilerAgent(self.device)
 
     try:
-      agent.StartAgentTracing(None, None)
+      agent.StartAgentTracing(perf_tracing_agent.PerfConfig(categories))
     finally:
       agent.StopAgentTracing()