Add preview user actions to xml file.

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 72a5ef2d02c022698c746d015027c34e578daade..47937fe5ca9cc1d11b0f3819428ebf65b0f4de8a 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -7382,6 +7382,26 @@ 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="MobilePreviewPageBack">
+  <owner>ksimbili@chromium.org</owner>
+  <description>
+    When user navigates back, using either system back or toolbar back button,
+    from the preview page.
+  </description>
+</action>
+
+<action name="MobilePreviewPageReload">
+  <owner>ksimbili@chromium.org</owner>
+  <description>
+    User pressed reload button while the preview page is being shown.
+  </description>
+</action>
+
+<action name="MobilePreviewPageTabClose">
+  <owner>ksimbili@chromium.org</owner>
+  <description>User closes the tab while preview page is loaded.</description>
+</action>
+
 <action name="MobileReceivedExternalIntent">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>