Add GetUserMedia ETLD+1 rappor metrics.

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 1412 matching lines @@
   <owner>wfh@chromium.org</owner>
   <summary>
     Deprecated with NPAPI removal. The domain and registry of the top level URL
     of a page which attempts to launch a Silverlight NPAPI plugin, if the client
     has Silverlight installed and enabled. Recorded when the plugin frame
     appears for each Silverlight object found on the page, even if the plugin is
     click-to-play.
   </summary>
 </rappor-metric>
 
+<rappor-metric name="PowerfulFeatureUse.ETLDPlus1.GetUserMedia.Insecure"
+    type="ETLD_PLUS_ONE">
+  <owner>guidou@chromium.org</owner>
+  <owner>grunell@chromium.org</owner>
+  <owner>hta@chromium.org</owner>
+  <summary>
+    The ETLD+1 of the URL that uses the getUserMedia API from an insecure
+    origin.
+  </summary>
+</rappor-metric>
+
+<rappor-metric name="PowerfulFeatureUse.ETLDPlus1.GetUserMedia.Secure"
+    type="ETLD_PLUS_ONE">
+  <owner>guidou@chromium.org</owner>
+  <owner>grunell@chromium.org</owner>
+  <owner>hta@chromium.org</owner>
+  <summary>
+    The ETLD+1 of the URL that uses the getUserMedia API from a secure origin.
+  </summary>
+</rappor-metric>
+
 <rappor-metric name="PowerfulFeatureUse.Host.ApplicationCacheAPI.Insecure"
     type="ETLD_PLUS_ONE">
   <owner>jww@chromium.org</owner>
   <summary>
     The host of the URL that uses a the Application Cache programmatic API from
     an insecure origin.
   </summary>
 </rappor-metric>
 
 <rappor-metric
@@ skipping 36 matching lines @@
   <owner>jww@chromium.org</owner>
   <summary>
     The host of the URL that uses the geolocation API from an insecure origin.
   </summary>
 </rappor-metric>
 
 <rappor-metric name="PowerfulFeatureUse.Host.GetUserMedia.Insecure"
     type="ETLD_PLUS_ONE">
   <owner>jww@chromium.org</owner>
   <summary>
-    The host of the URL that uses the getUserMedia API from an insecure origin.
+    **DEPRECATED. No longer reporting as of M53. Replaced by
+    PowerfulFeatureUse.ETLDPlus1.GetUserMedia.Insecure The host of the URL that
+    uses the getUserMedia API from an insecure origin.
   </summary>
 </rappor-metric>
 
 <rappor-metric name="PowerfulFeatureUse.Host.GetUserMedia.Secure"
     type="ETLD_PLUS_ONE">
   <owner>jww@chromium.org</owner>
   <summary>
-    The host of the URL that uses the getUserMedia API from a secure origin.
+    **DEPRECATED. No longer reporting as of M53. Replaced by
+    PowerfulFeatureUse.ETLDPlus1.GetUserMedia.Secure. The host of the URL that
+    uses the getUserMedia API from a secure origin.
   </summary>
 </rappor-metric>
 
 <rappor-metric name="PushMessaging.GenericNotificationShown.Origin"
     type="ETLD_PLUS_ONE">
   <owner>miguelg@chromium.org</owner>
   <summary>
     Number of times the generic (forced) notification was shown per origin.
     This happens if the site uses the push api but does not generate a
     notification of their own.
@@ skipping 393 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>