media: Report RAPPOR for media pipeline errors

tools/metrics/rappor/rappor.xml

 <!--
 Copyright 2015 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.
 -->
 
 <rappor-configuration>
 <!--
 This file is used to generate a comprehensive list of Chrome rappor metrics
 along with a detailed description for each histogram. See the design doc at
@@ skipping 598 matching lines @@
 </rappor-metric>
 
 <rappor-metric name="Media.OriginUrl.MSE.Insecure" type="ETLD_PLUS_ONE">
   <owner>wolenetz@chromium.org</owner>
   <summary>
     The domain and registry of the URL that loads an HTML5 media player using
     Media Source Extensions (MSE) from an insecure origin.
   </summary>
 </rappor-metric>
 
+<rappor-metric name="Media.OriginUrl.MSE.PipelineError" type="ETLD_PLUS_ONE">
+  <owner>xhwang@chromium.org</owner>
+  <summary>
+    The domain and registry of the URL that loads an HTML5 media player using
+    Media Source Extensions (MSE) and ends up with an error.
+  </summary>
+</rappor-metric>
+
 <rappor-metric name="Media.OriginUrl.MSE.Secure" type="ETLD_PLUS_ONE">
   <owner>wolenetz@chromium.org</owner>
   <summary>
     The domain and registry of the URL that loads an HTML5 media player using
     Media Source Extensions (MSE) from a potentially trustworthy origin.
   </summary>
 </rappor-metric>
 
 <rappor-metric name="Media.OriginUrl.SRC" type="ETLD_PLUS_ONE">
   <owner>xhwang@chromium.org</owner>
   <summary>
     The domain and registry of the URL that loads an HTML5 media player using
     SRC.
   </summary>
 </rappor-metric>
 
+<rappor-metric name="Media.OriginUrl.SRC.PipelineError" type="ETLD_PLUS_ONE">
+  <owner>xhwang@chromium.org</owner>
+  <summary>
+    The domain and registry of the URL that loads an HTML5 media player using
+    SRC and ends up with an error.
+  </summary>
+</rappor-metric>
+
 <rappor-metric name="NTP.ExplicitUserAction.PageNavigation.NTPTileClick"
     type="UMA_RAPPOR_TYPE">
   <owner>knn@chromium.org</owner>
   <summary>
     The eTLD+1 of the website visited by a user by clicking on the tile in the
     NewTabPage.
   </summary>
 </rappor-metric>
 
 <rappor-metric name="NTP.ExplicitUserAction.PageNavigation.OmniboxNonSearch"
@@ skipping 804 matching lines @@
     <flag>Bit 1: IS_REPEAT_VISIT</flag>
     <summary>
       Bitfield of the state from an SSL warning interstitial.
     </summary>
   </flags-field>
 </rappor-metric>
 
 </rappor-metrics>
 
 </rappor-configuration>