📰 Add visibility change triggers for bottom sheet content

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is a comprehensive list of Chrome user actions along with the owner
 and description for each user action.
 
@@ skipping 16101 matching lines @@
   <owner>dgn@chromium.org</owner>
   <description>User reverted the removal of a suggested site.</description>
 </action>
 
 <action name="Suggestions.Site.Removed">
   <owner>finkm@chromium.org</owner>
   <owner>dgn@chromium.org</owner>
   <description>User removed a suggested site.</description>
 </action>
 
+<action name="Suggestions.SurfaceFullyVisible">
+  <owner>finkm@chromium.org</owner>
+  <owner>dgn@chromium.org</owner>
+  <description>
+    ChromeHome: The Suggestion surface is loaded or brought in the foreground in
+    its fully visible state. In regular Chrome, MobileNTPShown is the
+    equivalent.
+  </description>
+</action>
+
+<action name="Suggestions.SurfaceHalfVisible">
+  <owner>finkm@chromium.org</owner>
+  <owner>dgn@chromium.org</owner>
+  <description>
+    ChromeHome: The Suggestion surface is loaded or brought in the foreground in
+    its half visible state. In regular Chrome, MobileNTPShown is the equivalent.
+  </description>
+</action>
+
 <action name="Suggestions.SurfaceHidden">
   <owner>finkm@chromium.org</owner>
   <owner>dgn@chromium.org</owner>
   <description>User closed the content suggestions UI.</description>
 </action>
 
 <action name="Suggestions.SurfaceVisible">
   <owner>finkm@chromium.org</owner>
   <owner>dgn@chromium.org</owner>
   <description>User opened the content suggestions UI.</description>
@@ skipping 1113 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>