Added metrics for background video playback.

tools/metrics/actions/actions.xml

Index: tools/metrics/actions/actions.xml
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index 5e25e02c17110ba0da3927913ae7d1190bff6267..5711475b3b9b189978b1939fd67855b4410a0097 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -8496,6 +8496,40 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Media.Hidden">

[Ilya Sherman, 2016/08/08 22:09:10]

Is this always a user-initiated action, or can it be programmatically initiated
as well?  Please either try to write the description in the form of "The user
did X", or possibly reconsider whether you really want to record this event as a
"user action".  Mounir recently went through and marked a number of actions as
not_user_triggered because they were interfering with metrics analysis.  It
would be a shame if these metrics led to similar noise.

(Please note that this comment applies to all of the metrics, even though I am
only mentioning it here.)

[whywhat, 2016/08/11 21:51:04]

Rewrote the description. We're trying to only track user interaction here.

+  <owner>avayvod@chromium.org</owner>
+  <description>A renderer media delegate is notified it's hidden.</description>

[mlamouri (slow - plz ping), 2016/08/08 13:19:31]

I'm not sure "renderer media delegate" is the right term to use. Unless you know
the code very well it will be unclear what this means and I think we want the
description to be readable by others than the engineers who work on this code :)

[whywhat, 2016/08/11 21:51:04]

Done.

+</action>
+
+<action name="Media.RemoteControls.Pause">
+  <owner>avayvod@chromium.org</owner>
+  <description>Media delegate is requested to pause media.</description>

[mlamouri (slow - plz ping), 2016/08/08 13:19:31]

Same as above. It's very unclear what "Media delegate" or "RemoteControls" is in
this case. Even as someone who knows the code, what's the difference with this
and media session?

[whywhat, 2016/08/11 21:51:04]

Done.

+</action>
+
+<action name="Media.RemoteControls.Play">
+  <owner>avayvod@chromium.org</owner>
+  <description>Media delegate is requested to resume media.</description>
+</action>
+
+<action name="Media.Session.BackgroundResume">
+  <owner>avayvod@chromium.org</owner>
+  <description>
+    Background video playback started for the render frame.
+  </description>
+</action>
+
+<action name="Media.Session.BackgroundSuspend">
+  <owner>avayvod@chromium.org</owner>
+  <description>
+    Background video playback stopped for the render frame.
+  </description>
+</action>
+
+<action name="Media.Shown">
+  <owner>avayvod@chromium.org</owner>
+  <description>A renderer media delegate is notified it's shown.</description>
+</action>
+
 <action name="MediaContextMenu_Controls">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>