Enable some profile_chrome unit tests on Trybots

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 dae236d4183a38e6ca48df18022ea0e9637895b1..8f8a7f7a766b9729c1e6c68b2620bf21fa8fdd75 100644
--- a/systrace/profile_chrome/perf_tracing_agent_unittest.py
+++ b/systrace/profile_chrome/perf_tracing_agent_unittest.py
@@ -7,9 +7,11 @@ import json
 from profile_chrome import agents_unittest
 from profile_chrome import perf_tracing_agent
 from profile_chrome import ui
+from systrace import decorators
 
 
 class PerfProfilerAgentTest(agents_unittest.BaseAgentTest):
+  @decorators.ClientOnlyTest
   def testGetCategories(self):
     if not perf_tracing_agent.PerfProfilerAgent.IsSupported():
       return
@@ -17,6 +19,9 @@ class PerfProfilerAgentTest(agents_unittest.BaseAgentTest):
         perf_tracing_agent.PerfProfilerAgent.GetCategories(self.device)
     assert 'cycles' in ' '.join(categories)
 
+  # TODO(washingtonp): Try enabling this test for the SimpleperfProfilerAgent,
+  # which will be added later.
+  @decorators.Disabled
   def testTracing(self):
     if not perf_tracing_agent.PerfProfilerAgent.IsSupported():
       return