Telemetry media Seek action and metrics.

tools/perf/perf_tools/media_metrics.py

-# Copyright 2013 The Chromium Authors. All rights reserved.
+# Copyright (c) 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.
 
 """Media Metrics 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.
 """
 
@@ skipping 10 matching lines @@
     self.tab = tab
 
   def Start(self):
     """Create the media metrics for all media elements in the document."""
     self.tab.ExecuteJavaScript('window.__createMediaMetricsForDocument()')
 
   def StopAndGetResults(self, results):
     """Reports all recorded metrics as Telemetry perf results."""
     media_metrics = self.tab.EvaluateJavaScript('window.__getAllMetrics()')
     for media_metric in media_metrics:
-      self.AddResultForMediaElement(media_metric, results)
+      self.AddResultsForMediaElement(media_metric, results)
 
-  def AddResultForMediaElement(self, media_metric, results):
+  def AddResultsForMediaElement(self, media_metric, results):
     """Reports metrics for one media element.
 
     Media metrics contain an ID identifying the media element and values:
     media_metric = {
       'id': 'video_1',
       'metrics': {
           'time_to_play': 120,
           'decoded_bytes': 13233,
           ...
       }
     }
     """
-    def AddResult(metric, unit):
+    def AddResults(metric, unit):
       metrics = media_metric['metrics']
-      if metric in metrics:
-        results.Add(trace, unit, str(metrics[metric]), chart_name=metric,
-                    data_type='default')
+      for m in metrics:
+        if m.startswith(metric):
+          special_label = m[len(metric):]
+          results.Add(trace + special_label, unit, str(metrics[m]),
+                      chart_name=metric, data_type='default')
 
     trace = media_metric['id']
     if not trace:
       logging.error('Metrics ID is missing in results.')
       return
-
-    AddResult('time_to_play', 'sec')
-    AddResult('playback_time', 'sec')
-    AddResult('decoded_audio_bytes', 'bytes')
-    AddResult('decoded_video_bytes', 'bytes')
-    AddResult('decoded_frame_count', 'frames')
-    AddResult('dropped_frame_count', 'frames')
+    AddResults('decoded_audio_bytes', 'bytes')
+    AddResults('decoded_video_bytes', 'bytes')
+    AddResults('decoded_frame_count', 'frames')
+    AddResults('dropped_frame_count', 'frames')
+    AddResults('playback_time', 'sec')
+    AddResults('seek', 'sec')
+    AddResults('time_to_play', 'sec')