Add field trial and flag to mark HTTP as non-secure.

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 164 matching lines @@
 <action name="AboutFlags_instant-autocomplete-immediately">
   <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="AboutFlags_instant-type">
   <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="AboutFlags_mark-http-as-non-secure">
+  <owner>palmer@chromium.org, felt@chromium.org</owner>

[Mark P, 2015/01/02 19:14:28]

owner is a repeated field, one e-mail address per entry.

[palmer, 2015/01/07 00:59:00]

Done.

+  <description>
+    This flag lets users opt into or out of marking HTTP as Dubious or as

[Mark P, 2015/01/02 19:14:28]

 Actions need to clearly state when they are emitted.

More importantly, after a quick glance over your changelist, I don't see where
this action is emitted.  Did you forget to add the code?

[palmer, 2015/01/07 00:59:00]

I'm not sure what you mean. I think I am following the instructions in
chrome/browser/about_flags.cc, under "RECORDING USER METRICS FOR FLAGS".

[Mark P, 2015/01/07 22:43:58]

Ah, I didn't notice this was using that action recording system.

In that case, you need to revise your comment explain when this action is
emitted.  In this case, it's once per startup when the flag is active.

Also, why do you want this?  I believe it will get recorded if the user sets it
regardless of what value the user sets it to.  Is that useful for you?  You'll
know the usage of the flag but not what people are using it for...

+    Non-Secure.
+  </description>
+</action>
+
 <action name="AboutFlags_match-preview">
   <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="AboutFlags_my-special-feature">
   <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>
 
@@ skipping 11653 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>