chromeos: Add Screenshot_Annotate metric.

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 11e5c7e632962fa807c7efa538a419ac930937af..5b86138dd871586b96dfc4ba2501fabf20651b27 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -3751,6 +3751,8 @@ should be able to be added at any place in this file.
 
 <action name="DownloadNotification.Button_Annotate">
   <owner>derat@chromium.org</owner>
+  <owner>jdufault@chromium.org</owner>
+  <owner>tbuckley@chromium.org</owner>
   <description>
     User pushes &quot;Annotate&quot; button on download notification.
   </description>
@@ -13488,6 +13490,16 @@ 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="Screenshot_Annotate">
+  <owner>derat@chromium.org</owner>
+  <owner>jdufault@chromium.org</owner>
+  <owner>tbuckley@chromium.org</owner>
+  <description>
+    User clicks the &quot;Annotate&quot; button in the notification displayed
+    after taking a screenshot.
+  </description>
+</action>
+
 <action name="Screenshot_CopyClipboard">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>