Added UMA metrics for screen capture UI in the status area.

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 e11e0378f72bba6f6d7ab74b4f91f5dca1e399bb..cde9e8fdf743ab73049892bd7087c8420ddbba16 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -13900,6 +13900,24 @@ 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="StatusArea_ScreenCapture_Stopped_Default">
+  <owner>bruthig@chromium.org</owner>
+  <owner>tbuckley@chromium.org</owner>
+  <description>
+    Counts the number of times the user stops screen capturing via the default
+    &quot;Screen Capture&quot; view in the system menu.

[tdanderson, 2016/07/07 21:54:31]

nit: remove quotes

Consider rewording for clarity: "... via the screen capture row in the system
menu" or "... via the screen capture row's stop button in the system menu"

[bruthig, 2016/07/08 14:26:53]

Done.

+  </description>
+</action>
+
+<action name="StatusArea_ScreenCapture_Stopped_Notification">
+  <owner>bruthig@chromium.org</owner>
+  <owner>tbuckley@chromium.org</owner>
+  <description>
+    Counts the number of times the user stops screen capturing via the &quot;
+    Screen Capture&quot; notification.

[tdanderson, 2016/07/07 21:54:31]

nit: remove quotes

Is this notification part of the notifications center, or is it one of those
standalone pre-notification-center "notifications" ? May be worth clarifying
here if, for instance, this action ever gets used to measure something related
to the notification center as a whole.

[bruthig, 2016/07/08 14:26:53]

Done.

+  </description>
+</action>
+
 <action name="StatusArea_SignOut">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>