[Systrace] Fix systrace clock syncing issue with BattOr.

telemetry/telemetry/timeline/trace_data.py

Index: telemetry/telemetry/timeline/trace_data.py
diff --git a/telemetry/telemetry/timeline/trace_data.py b/telemetry/telemetry/timeline/trace_data.py
index e6dcf5ee9e05e60ea7619fa1ca8d6ca68d29e4e4..5f61065a20e7cce1d94c3ed45d81882e7c86a3fc 100644
--- a/telemetry/telemetry/timeline/trace_data.py
+++ b/telemetry/telemetry/timeline/trace_data.py
@@ -48,7 +48,10 @@ ATRACE_PART = TraceDataPart('systemTraceEvents')
 BATTOR_TRACE_PART = TraceDataPart('powerTraceAsString')
 CHROME_TRACE_PART = TraceDataPart('traceEvents')
 CPU_TRACE_DATA = TraceDataPart('cpuSnapshots')
+DDMS_TRACE_PART = TraceDataPart('ddms')
+FTRACE_DATA_PART = TraceDataPart('ftrace')
 INSPECTOR_TRACE_PART = TraceDataPart('inspectorTimelineEvents')
+PROFILER_TRACE_PART = TraceDataPart('profiler')
 SURFACE_FLINGER_PART = TraceDataPart('surfaceFlinger')
 TAB_ID_PART = TraceDataPart('tabIds')
 TELEMETRY_PART = TraceDataPart('telemetry')
@@ -57,7 +60,10 @@ ALL_TRACE_PARTS = {ATRACE_PART,
                    BATTOR_TRACE_PART,
                    CHROME_TRACE_PART,
                    CPU_TRACE_DATA,
+                   DDMS_TRACE_PART,
+                   FTRACE_DATA_PART,
                    INSPECTOR_TRACE_PART,
+                   PROFILER_TRACE_PART,
                    SURFACE_FLINGER_PART,
                    TAB_ID_PART,
                    TELEMETRY_PART}
@@ -101,6 +107,9 @@ class TraceData(object):
     self._raw_data = {}
     self._events_are_safely_mutable = False
 
+  def __len__(self):
+    return len(self._raw_data)
+
   def _SetFromBuilder(self, d):
     self._raw_data = d
     self._events_are_safely_mutable = True