Enable some profile_chrome unit tests on Trybots

systrace/profile_chrome/chrome_startup_tracing_agent_unittest.py

Index: systrace/profile_chrome/chrome_startup_tracing_agent_unittest.py
diff --git a/systrace/profile_chrome/chrome_startup_tracing_agent_unittest.py b/systrace/profile_chrome/chrome_startup_tracing_agent_unittest.py
index d07fd26bba0ab2a7a644e4aef9186ee4839aa48f..85732da80c4aad5b709b3be96384ef6f2b06984c 100644
--- a/systrace/profile_chrome/chrome_startup_tracing_agent_unittest.py
+++ b/systrace/profile_chrome/chrome_startup_tracing_agent_unittest.py
@@ -6,9 +6,15 @@ import json
 
 from profile_chrome import chrome_startup_tracing_agent
 from profile_chrome import agents_unittest
+from systrace import decorators
 
 
 class ChromeAgentTest(agents_unittest.BaseAgentTest):
+  # TODO(washingtonp): This test seems to fail on the version of Android
+  # currently on the Trybot servers (KTU84P), although it works on Android M.
+  # Either upgrade the version of Android on the Trybot servers or determine
+  # if there is a way to run this agent on Android KTU84P.
+  @decorators.Disabled
   def testTracing(self):
     agent = chrome_startup_tracing_agent.ChromeStartupTracingAgent(
         self.device, self.package_info, False, 'https://www.google.com')