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 8d15ca53843d9056536950f295833893f9871c2b..d5d172ca38d08608d7d7fe335dee913c60861699 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -20971,6 +20971,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Media.Notification.ClickSource"

[mlamouri (slow - plz ping), 2016/04/22 10:32:50]

"Media.Notification.Click" is probably better. We are recording the clicks and
it happens that we also record the sources.

[Zhiqiang Zhang (Slow), 2016/04/22 12:41:47]

Done.

+    enum="MediaNotificationClickSource">
+  <owner>mlamouri@chromium.org</owner>
+  <owner>avayvod@chromium.org</owner>
+  <owner>zqzhang@chromium.org</owner>
+  <summary>
+    Records which kind of notification the user clicked to go back to Chrome.

[mlamouri (slow - plz ping), 2016/04/22 10:32:50]

Same as above. Maybe something like:
"Records when the user click a media notification to go back to Chrome."

[Zhiqiang Zhang (Slow), 2016/04/22 12:41:47]

Rephrased to "The type of media notification the user clicked to go back to
Chrome"

+  </summary>
+</histogram>
+
 <histogram name="Media.PepperVideoDecoderError"
     enum="VideoDecodeAcceleratorError">
   <owner>ihf@chromium.org</owner>
@@ -77163,6 +77173,12 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="2" label="MediaStream"/>
 </enum>
 
+<enum name="MediaNotificationClickSource" type="int">
+  <int value="0" label="Media"/>
+  <int value="1" label="Presentation"/>
+  <int value="2" label="MediaFling"/>
+</enum>
+
 <enum name="MediaOutputProtectionStatus" type="int">
   <int value="0" label="Queried"/>
   <int value="1" label="No external link"/>