[Systrace] Fix systrace clock syncing issue with BattOr.

systrace/systrace/tracing_agents/__init__.py

Index: systrace/systrace/tracing_agents/__init__.py
diff --git a/systrace/systrace/tracing_agents/__init__.py b/systrace/systrace/tracing_agents/__init__.py
index 859d7795c1ea97d075737816db9824d88eb97e10..d8f22cdbc361bcc12f5acdd6729ca783dbc942a2 100644
--- a/systrace/systrace/tracing_agents/__init__.py
+++ b/systrace/systrace/tracing_agents/__init__.py
@@ -41,7 +41,7 @@ class TracingAgent(object):
     Returns:
         Boolean value indicating whether or not the trace started successfully.
     '''
-    pass
+    raise NotImplementedError
 
   def StopAgentTracing(self, timeout=None):
     '''Stops running the trace for this agent and returns immediately.
@@ -53,7 +53,7 @@ class TracingAgent(object):
     Returns:
         Boolean value indicating whether or not the trace started successfully.
     '''
-    pass
+    raise NotImplementedError
 
   def SupportsExplicitClockSync(self):
     '''Find out if this agent supports recording of clock sync markers.
@@ -85,7 +85,11 @@ class TracingAgent(object):
 
     Args:
         timeout: Timeout interval in seconds.
+        builder: Trace data builder.
     Returns:
         Completed trace for this agent.
     '''
     pass
+
+  def CollectAgentTraceData(self, trace_data_builder):
+    raise NotImplementedError