[Systrace] Fix systrace clock syncing issue with BattOr.

systrace/profile_chrome/fake_agent_1.py

Index: systrace/profile_chrome/fake_agent_1.py
diff --git a/systrace/profile_chrome/fake_agent_1.py b/systrace/profile_chrome/fake_agent_1.py
index 62889f4526fe83b9c6679df12fc74885d0e323c3..4428e8a59919f4c63214d6bdb8f9e7e2664aecd7 100644
--- a/systrace/profile_chrome/fake_agent_1.py
+++ b/systrace/profile_chrome/fake_agent_1.py
@@ -7,6 +7,7 @@ import tempfile
 
 from systrace import trace_result
 from systrace import tracing_agents
+from telemetry.timeline import trace_data as trace_data_module
 
 
 class FakeAgent(object):
@@ -50,6 +51,9 @@ class FakeAgent(object):
   def __repr__(self):
     return 'faketrace'
 
+  def CollectAgentTraceData(self, builder):
+    builder.AddTraceFor(trace_data_module.SURFACE_FLINGER_PART, 'fake-contents')
+
 
 class FakeConfig(tracing_agents.TracingConfig):
   def __init__(self):