[telemetry] Timeline model cleanups

tools/telemetry/telemetry/core/timeline/tracing/counter.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.
-
-class Counter(object):
-  ''' Stores all the samples for a given counter.
-  '''
-  def __init__(self, parent, category, name):
-    self.parent = parent
-    self.full_name  = category + '.' + name
-    self.category = category
-    self.name = name
-    self.samples = []
-    self.timestamps = []
-    self.series_names = []
-    self.totals = []
-    self.max_total = 0
-    self._bounds = None
-
-  @property
-  def min_timestamp(self):
-    if not self._bounds:
-      self.UpdateBounds()
-    return self._bounds[0]
-
-  @property
-  def max_timestamp(self):
-    if not self._bounds:
-      self.UpdateBounds()
-    return self._bounds[1]
-
-  @property
-  def num_series(self):
-    return len(self.series_names)
-
-  @property
-  def num_samples(self):
-    return len(self.timestamps)
-
-  def UpdateBounds(self):
-    if self.num_series * self.num_samples != len(self.samples):
-      raise ValueError(
-          'Length of samples must be a multiple of length of timestamps.')
-
-    self.totals = []
-    self.max_total = 0
-    if not len(self.samples):
-      return
-
-    self._bounds = (self.timestamps[0], self.timestamps[-1])
-
-    max_total = None
-    for i in xrange(self.num_samples):
-      total = 0
-      for j in xrange(self.num_series):
-        total += self.samples[i * self.num_series + j]
-        self.totals.append(total)
-      if max_total is None or total > max_total:
-        max_total = total
-    self.max_total = max_total
-