Reland [telemetry] Timeline model cleanups

tools/telemetry/telemetry/core/timeline/slice.py

Index: tools/telemetry/telemetry/core/timeline/slice.py
diff --git a/tools/telemetry/telemetry/core/timeline/slice.py b/tools/telemetry/telemetry/core/timeline/slice.py
new file mode 100644
index 0000000000000000000000000000000000000000..5ce2b28a84d9598994979b42073c8a154018065a
--- /dev/null
+++ b/tools/telemetry/telemetry/core/timeline/slice.py
@@ -0,0 +1,52 @@
+# 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.event as timeline_event
+
+class Slice(timeline_event.TimelineEvent):
+  """A Slice represents an interval of time plus parameters associated
+  with that interval.
+
+  NOTE: The Sample class implements the same interface as
+  Slice. These must be kept in sync.
+
+  All time units are stored in milliseconds.
+  """
+  def __init__(self, parent_thread, category, name, timestamp,
+               args=None, duration=0):
+    super(Slice, self).__init__(
+        category, name, timestamp, duration, args=args)
+    self.parent_thread = parent_thread
+    self.parent_slice = None
+    self.sub_slices = []
+    self.did_not_finish = False
+
+  def AddSubSlice(self, 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
+      for sub_sub in sub_slice.IterEventsInThisContainerRecrusively():
+        yield sub_sub
+
+  @property
+  def self_time(self):
+    """Time spent in this function less any time spent in child events."""
+    child_total = sum(
+      [e.duration for e in self.sub_slices])
+    return self.duration - child_total
+
+  def _GetSubSlicesRecursive(self):
+    for sub_slice in self.sub_slices:
+      for s in sub_slice.GetAllSubSlices():
+        yield s
+      yield sub_slice
+
+  def GetAllSubSlices(self):
+    return list(self._GetSubSlicesRecursive())
+
+  def GetAllSubSlicesOfName(self, name):
+    return [e for e in self.GetAllSubSlices() if e.name == name]