Add a counter for clicking on Form-Not-Secure warnings

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 1551 matching lines @@
 
 <action name="Autofill_ShowedCreditCardSuggestions">
   <owner>sebsg@chromium.org</owner>
   <description>
     This user action is logged when the user is shown some credit card
     suggestions. This should always happen after a
     Autofill_PolledCreditCardSuggestion.
   </description>
 </action>
 
+<action name="Autofill_ShowedHttpNotSecureExplanation">
+  <owner>estark@chromium.org</owner>
+  <description>
+    This user action is logged when the user selects a &quot;Login not
+    secure&quot; or &quot;Payment not secure&quot; warning item in the autofill
+    dropdown to show more information about the warning.
+  </description>
+</action>
+
 <action name="Autofill_ShowedProfileSuggestions">
   <owner>sebsg@chromium.org</owner>
   <description>
     This user action is logged when the user is shown some profile suggestions.
     This should always happen after a Autofill_PolledProfileSuggestion.
   </description>
 </action>
 
 <action name="AutomaticReset_WebUIBanner_BannerShown">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
@@ skipping 11653 matching lines @@
 <action name="PasswordManager_RemovePasswordException">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="PasswordManager_RemoveSavedPassword">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="PasswordManager_ShowedHttpNotSecureExplanation">
+  <owner>estark@chromium.org</owner>
+  <description>
+    The user selected the &quot;Login not secure&quot; or &quot;Form not
+    secure&quot; item in the password manager autofill dropdown to show more
+    information about the warning.
+  </description>
+</action>
+
 <action name="PasswordManager_SyncCredentialFilledAndLoginSuccessfull">
   <owner>vabr@chromium.org</owner>
   <owner>vasilii@chromium.org</owner>
   <description>
     Counts the number of times when Chrome fills the user's sync account
     credentials, and the user logs in successfully after submitting them.
   </description>
 </action>
 
 <action name="PasswordManager_SyncCredentialShown">
@@ skipping 3111 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>