[Systrace] Fix systrace clock syncing issue with BattOr.

systrace/systrace/tracing_agents/atrace_from_file_agent.py

Index: systrace/systrace/tracing_agents/atrace_from_file_agent.py
diff --git a/systrace/systrace/tracing_agents/atrace_from_file_agent.py b/systrace/systrace/tracing_agents/atrace_from_file_agent.py
index fadd96ca2e768026926d16a38b670cc0872f8936..70eaf70b77d6e43eed7252e90fa013e1ea7415a6 100644
--- a/systrace/systrace/tracing_agents/atrace_from_file_agent.py
+++ b/systrace/systrace/tracing_agents/atrace_from_file_agent.py
@@ -9,6 +9,7 @@ import re
 from systrace import trace_result
 from systrace import tracing_agents
 from systrace.tracing_agents import atrace_agent
+from telemetry.timeline import trace_data
 
 
 # ADB sends this text to indicate the beginning of the trace data.
@@ -65,6 +66,9 @@ class AtraceFromFileAgent(tracing_agents.TracingAgent):
   def GetResults(self, timeout=None):
     return trace_result.TraceResult('trace-data', self._trace_data)
 
+  def CollectAgentTraceData(self, trace_data_builder):
+    trace_data_builder.AddTraceFor(trace_data.ATRACE_PART, self._trace_data)
+
   def _read_trace_data(self):
     with open(self._filename, 'r') as f:
       result = f.read()