[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/metrics/cpu.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.
 
+from telemetry.value import scalar
+
 from metrics import Metric
-from telemetry.value import scalar
 
 
 class CpuMetric(Metric):
   """Calulates CPU load over a span of time."""
 
   def __init__(self, browser):
     super(CpuMetric, self).__init__()
     self._browser = browser
     self._start_cpu = None
     self._stop_cpu = None
@@ skipping 53 matching lines @@
     # Linux kernel starts with a value close to an overflow, so correction is
     # necessary.
     if total_time < 0:
       total_time += 2**32
     # Assert that the arguments were given in the correct order.
     assert total_time > 0 and total_time < 2**31, (
         'Expected total_time > 0, was: %d' % total_time)
     cpu_usage[process_type] = float(cpu_process_time) / total_time
   return cpu_usage