Report WMPI components memory usage to UMA

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 2eb96e8a847bbd4e1f3fe7623592b299f184c27c..45242bed6d00bb5602384e31d4d57c54a80c413e 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -25854,6 +25854,38 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.WebMediaPlayerImpl.Memory.Audio" units="KB">
+  <owner>servolk@chromium.org</owner>
+  <summary>
+    Amount of memory used by the WebMediaPlayerImpl audio renderer when memory
+    pressure was reported.
+  </summary>
+</histogram>
+
+<histogram name="Media.WebMediaPlayerImpl.Memory.DataSource" units="KB">
+  <owner>servolk@chromium.org</owner>
+  <summary>
+    Amount of memory used by the WebMediaPlayerImpl data source when memory
+    pressure was reported.
+  </summary>
+</histogram>
+
+<histogram name="Media.WebMediaPlayerImpl.Memory.Demuxer" units="KB">
+  <owner>servolk@chromium.org</owner>
+  <summary>
+    Amount of memory used by the WebMediaPlayerImpl demuxer when memory pressure
+    was reported.
+  </summary>
+</histogram>
+
+<histogram name="Media.WebMediaPlayerImpl.Memory.Video" units="KB">
+  <owner>servolk@chromium.org</owner>
+  <summary>
+    Amount of memory used by the WebMediaPlayerImpl video renderer when memory
+    pressure was reported.
+  </summary>
+</histogram>

[Ilya Sherman, 2016/12/14 20:09:48]

Optional: You might want to use a histogram_suffixes element to reduce the
amount of repetition in this file.

+
 <histogram name="Media.WindowsCoreAudioInput" enum="BooleanSuccess">
   <owner>henrika@chromium.org</owner>
   <summary>