Add UMA for the new generic permisison class

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 fb613df197bb1eca80c55b226c2946d8ff88a601..3a1bb27ac3c4c5741d811b432be2ab5ca95964e8 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -8250,8 +8250,10 @@ should be able to be added at any place in this file.
 </action>
 
 <action name="Options_DefaultMIDISysExSettingChanged">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>toyoshim@chromium.org</owner>
+  <description>
+    Triggers when the default decision for push message permissions is changed.

[Mark P, 2014/07/08 20:49:03]

Why is this description the same as the description to a different action? 
Shouldn't this description mention MIDI...?

[Miguel Garcia, 2014/07/09 11:17:19]

Indeed

+  </description>
 </action>
 
 <action name="Options_DefaultMediaStreamMicSettingChanged">
@@ -8289,6 +8291,13 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="Options_DefaultPushMessagingSettingChanged">
+  <owner>miguelg@chromium.org</owner>
+  <description>
+    Triggers when the default decision for push message permissions is changed.
+  </description>
+</action>
+
 <action name="Options_DictionaryLanguage">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>