[Systrace] Fix systrace clock syncing issue with BattOr.

systrace/systrace/tracing_agents/__init__.py

 #!/usr/bin/env python
 
 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 '''Tracing agent interface for systrace.
 
 This class represents an agent that captures traces from a particular
 tool (e.g. atrace, ftrace.)
@@ skipping 23 matching lines @@
     not completed within timeout interval.
 
     Args:
         config: TracingConfig subclass containing agent-specific options
                 and categories.
         timeout: Timeout interval in seconds.
 
     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.
     Stops with timeout if not completed within timeout interval.
 
     Args:
         timeout: Timeout interval in seconds.
 
     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.
 
     Returns:
         Boolean value indicating whether this agent supports recording
         of clock sync markers.
     '''
     raise NotImplementedError
 
@@ skipping 11 matching lines @@
   def GetResults(self, timeout=None):
     '''Get the completed trace for this agent, stopping with timeout
 
     Get the completed trace for this agent. Call only after
     StopAgentTracing is done. This function blocks until the result
     is collected (note; this may take several seconds). Stops with timeout
     if not completed within self._options.collection_timeout seconds.
 
     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