[telemetry] Timeline model cleanups

tools/telemetry/telemetry/core/timeline/async_slice.py

 # Copyright 2013 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.
 
-import telemetry.core.timeline.tracing.slice as tracing_slice
+import telemetry.core.timeline.event as event
 
-class AsyncSlice(tracing_slice.Slice):
+class AsyncSlice(event.TimelineEvent):
   ''' A AsyncSlice represents an interval of time during which an
   asynchronous operation is in progress. An AsyncSlice consumes no CPU time
   itself and so is only associated with Threads at its start and end point.
   '''
-  def __init__(self, category, name, timestamp, args=None, parent=None):
+  def __init__(self, category, name, timestamp, args=None):
     super(AsyncSlice, self).__init__(
-        category, name, timestamp, args=args, parent=parent)
+        category, name, timestamp, duration=0, args=args)
+    self.parent_slice = None
     self.start_thread = None
     self.end_thread = None
+    self.sub_slices = []
     self.id = None
 
   def AddSubSlice(self, sub_slice):

[Tim Song, 2013/07/18 22:56:36]

We should just assign the parent_slice here instead of doing it before hand.

[nduca, 2013/07/18 23:03:40]

No.

-    super(AsyncSlice, self).AddSubSlice(sub_slice)
-    self.children.append(sub_slice)
+    assert sub_slice.parent_slice == self
+    self.sub_slices.append(sub_slice)
+
+
+  def IterEventsInThisContainerRecrusively(self):
+    for sub_slice in self.sub_slices:
+      yield sub_slice