Enable some profile_chrome unit tests on Trybots

systrace/profile_chrome/chrome_tracing_agent_unittest.py

Index: systrace/profile_chrome/chrome_tracing_agent_unittest.py
diff --git a/systrace/profile_chrome/chrome_tracing_agent_unittest.py b/systrace/profile_chrome/chrome_tracing_agent_unittest.py
index 27df2c7ae3bbe7c3a9f8ac2b66919b2b91e4a6c0..5f6793a9133e8330851c6a97096a35c43365cf5e 100644
--- a/systrace/profile_chrome/chrome_tracing_agent_unittest.py
+++ b/systrace/profile_chrome/chrome_tracing_agent_unittest.py
@@ -6,10 +6,20 @@ import json
 
 from profile_chrome import chrome_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 testGetCategories(self):
+    curr_browser = self.GetChromeProcessID()
+    if curr_browser == None:
+      self.StartBrowser()
+
     categories = \
         chrome_tracing_agent.ChromeTracingAgent.GetCategories(
             self.device, self.package_info)
@@ -18,7 +28,16 @@ class ChromeAgentTest(agents_unittest.BaseAgentTest):
     self.assertTrue(categories[0])
     self.assertTrue(categories[1])
 
+  # TODO(washingtonp): This test is pretty flaky 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):
+    curr_browser = self.GetChromeProcessID()
+    if curr_browser == None:
+      self.StartBrowser()
+
     categories = '*'
     ring_buffer = False
     agent = chrome_tracing_agent.ChromeTracingAgent(self.device,