[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/metrics/media.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 logging
 import os
 
-from metrics import Metric
 from telemetry.value import list_of_scalar_values
 from telemetry.value import scalar
 
+from metrics import Metric
+
 
 class MediaMetric(Metric):
   """MediaMetric class injects and calls JS responsible for recording metrics.
 
   Default media metrics are collected for every media element in the page,
   such as decoded_frame_count, dropped_frame_count, decoded_video_bytes, and
   decoded_audio_bytes.
   """
 
   def __init__(self, tab):
@@ skipping 66 matching lines @@
       AddOneResult('buffering_time', 'ms')
       AddOneResult('decoded_audio_bytes', 'bytes')
       AddOneResult('decoded_video_bytes', 'bytes')
       AddOneResult('decoded_frame_count', 'frames')
       AddOneResult('dropped_frame_count', 'frames')
       AddOneResult('time_to_play', 'ms')
 
     AddOneResult('avg_loop_time', 'ms')
     AddOneResult('seek', 'ms')
     return trace