[Systrace] Fix systrace clock syncing issue with BattOr.

systrace/profile_chrome/ddms_tracing_agent.py

Index: systrace/profile_chrome/ddms_tracing_agent.py
diff --git a/systrace/profile_chrome/ddms_tracing_agent.py b/systrace/profile_chrome/ddms_tracing_agent.py
index 276a3b9fb055a92ef9b11770fed647a8dd82b803..35c29b1187b73d66c103228b1ae57cc83ba921c9 100644
--- a/systrace/profile_chrome/ddms_tracing_agent.py
+++ b/systrace/profile_chrome/ddms_tracing_agent.py
@@ -10,6 +10,7 @@ import re
 from profile_chrome import util
 from systrace import trace_result
 from systrace import tracing_agents
+from telemetry.timeline import trace_data as trace_data_module
 
 
 _DDMS_SAMPLING_FREQUENCY_US = 100
@@ -54,6 +55,11 @@ class DdmsAgent(tracing_agents.TracingAgent):
       trace_data = f.read()
     return trace_result.TraceResult('ddms', trace_data)
 
+  def CollectAgentTraceData(self, trace_data_builder):
+    with open(self._PullTrace(), 'r') as f:
+      trace_data = f.read()
+    trace_data_builder(trace_data_module.DDMS_TRACE_PART, trace_data)
+
   def _PullTrace(self):
     if not self._output_file:
       return None