[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/metrics/power.py

 # Copyright 2014 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 time
 
-from metrics import Metric
 from telemetry.core.platform import process_statistic_timeline_data
 from telemetry.value import scalar
 
+from metrics import Metric
+
 
 class PowerMetric(Metric):
   """A metric for measuring power usage."""
 
   # System power draw while idle.
   _quiescent_power_draw_mwh = 0
 
   def __init__(self, platform, quiescent_measurement_time_s=0):
     """PowerMetric Constructor.
 
@@ skipping 165 matching lines @@
       continue
 
     assert isinstance(cpu_stats[process_type]['IdleWakeupCount'],
         process_statistic_timeline_data.IdleWakeupTimelineData)
     idle_wakeup_delta = (cpu_stats[process_type]['IdleWakeupCount'] -
                         start_cpu_stats[process_type]['IdleWakeupCount'])
     cpu_delta[process_type] = idle_wakeup_delta.total_sum()
     total = total + cpu_delta[process_type]
   cpu_delta['Total'] = total
   return cpu_delta