Add User Actions for Reading List

BUG=651041

Review-Url: https://codereview.chromium.org/2569223002
Cr-Commit-Position: refs/heads/master@{#438186}

tools/metrics/actions/actions.xml

@@ -9881,6 +9881,40 @@ should be able to be added at any place in this file.
   <description>User switched on torch in the QR Scanner.</description>
 </action>
 
+<action name="MobileReadingListAdd">
+  <owner>gambard@chromium.org</owner>
+  <description>
+    User added an entry to the ReadingList from inside Chrome.
+  </description>
+</action>
+
+<action name="MobileReadingListDeleteRead">
+  <owner>gambard@chromium.org</owner>
+  <description>
+    User deleted all the read entries of the ReadingList using 'Delete All
+    Read'.
+  </description>
+</action>
+
+<action name="MobileReadingListMarkRead">
+  <owner>gambard@chromium.org</owner>
+  <description>
+    User marked one or multiple ReadingList entries as 'Read'.
+  </description>
+</action>
+
+<action name="MobileReadingListMarkUnread">
+  <owner>gambard@chromium.org</owner>
+  <description>
+    User marked one or multiple ReadingList entries as 'Unread'.
+  </description>
+</action>
+
+<action name="MobileReadingListOpen">
+  <owner>gambard@chromium.org</owner>
+  <description>User opened a ReadingList entry.</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>