Move timeline and importers to use telemetry.value.TraceValue

tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py

Index: tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py b/tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py
index 15369ffd493344fb6e85e2c1ced7474ed57a8a80..172f62b34114926b2ba9110e1e4cb6df860ea4d8 100644
--- a/tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py
+++ b/tools/telemetry/telemetry/core/backends/chrome/inspector_backend.py
@@ -18,8 +18,8 @@ from telemetry.core.backends.chrome import inspector_runtime
 from telemetry.core.backends.chrome import inspector_timeline
 from telemetry.core.backends.chrome import inspector_websocket
 from telemetry.core.backends.chrome import websocket
-from telemetry.core.heap import model
-from telemetry.timeline import model as timeline_model
+from telemetry.core.heap import model as heap_model_module
+from telemetry.timeline import model as timeline_model_module
 from telemetry.timeline import recording_options
 
 
@@ -193,16 +193,21 @@ class InspectorBackend(inspector_websocket.InspectorWebsocket):
       self._network.timeline_recorder.Start()
 
   def StopTimelineRecording(self):
-    data = []
-    timeline_data = self._timeline.Stop()
-    if timeline_data:
-      data.append(timeline_data)
-    network_data = self._network.timeline_recorder.Stop()
-    if network_data:
-      data.append(network_data)
+    builder = trace_value_module.TraceValueBuilder()
+
+    data = self._timeline.Stop()
+    if data:
+      builder.AddEventsTo(
+          trace_value_module.INSPECTOR_TRACE_PART, data)
+
+    data = self._network.timeline_recorder.Stop()
     if data:
-      self._timeline_model = timeline_model.TimelineModel(
-          timeline_data=data, shift_world_to_zero=False)
+      builder.AddEventsTo(
+          trace_value_module.INSPECTOR_TRACE_PART, data)
+
+    if builder.HasEventsFor(trace_value_module.INSPECTOR_TRACE_PART):
+      self._timeline_model = timeline_model_module.TimelineModel(
+          builder.AsValue(), shift_world_to_zero=False)
     else:
       self._timeline_model = None
 
@@ -315,4 +320,4 @@ class InspectorBackend(inspector_websocket.InspectorWebsocket):
     snapshot = ''.join(snapshot)
 
     self.UnregisterDomain('HeapProfiler')
-    return model.Model(snapshot)
+    return heap_model_module.Model(snapshot)