Move timeline and importers to use telemetry.value.TraceValue

tools/perf/measurements/smoothness_controller.py

Index: tools/perf/measurements/smoothness_controller.py
diff --git a/tools/perf/measurements/smoothness_controller.py b/tools/perf/measurements/smoothness_controller.py
index b29a1edda5c75953925564a8640737a20515c65e..dc2e572a6100af77c3a7f4ae89480b2c91e649ea 100644
--- a/tools/perf/measurements/smoothness_controller.py
+++ b/tools/perf/measurements/smoothness_controller.py
@@ -30,7 +30,7 @@ class MissingDisplayFrameRateError(page_measurement.MeasurementFailure):
 class SmoothnessController(object):
   def __init__(self):
     self._timeline_model = None
-    self._tracing_timeline_data = None
+    self._trace_value = None
     self._interaction = None
 
   def SetUp(self, page, tab):
@@ -54,9 +54,8 @@ class SmoothnessController(object):
     # Stop tracing for smoothness metric.
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
       tab.browser.platform.StopRawDisplayFrameRateMeasurement()
-    self._tracing_timeline_data = tab.browser.StopTracing()
-    self._timeline_model = TimelineModel(
-      timeline_data=self._tracing_timeline_data)
+    self._trace_value = tab.browser.StopTracing()
+    self._timeline_model = TimelineModel(self._trace_value)
 
   def AddResults(self, tab, results):
     # Add results of smoothness metric. This computes the smoothness metric for
@@ -88,7 +87,7 @@ class SmoothnessController(object):
     if len(smooth_records) == 0:
       if run_smooth_actions_record is None:
         sys.stderr.write('Raw tracing data:\n')
-        sys.stderr.write(repr(self._tracing_timeline_data.EventData()))
+        self._trace_value.Serialize(sys.stderr)
         sys.stderr.write('\n')
         raise Exception('SmoothnessController failed to issue markers for the '
                         'whole interaction.')