Introduce moderate binding

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 7494 matching lines @@
 <action name="MixedScript_LoadAnyway_Bubble">
   <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="MobileActionBarShown">
   <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="MobileBackgroundRendererCrashedOnForegroundApp">

[Alexei Svitkine (slow), 2015/06/17 16:57:22]

What's the reason for making this an action rather than a boolean histogram?

[Jaekyun Seok (inactive), 2015/06/17 22:31:50]

We are already using an action named "MobileRendererCrashed" to log renderer
crash in the foreground;
https://cs.corp.google.com/#clankium/src/chrome/browser/android/metrics/uma_s....

So I introduced another action to log renderer crash in the background. Do you
think that using a histogram is properer?

[Alexei Svitkine (slow), 2015/06/18 15:34:33]

Yeah, in my opinion it would be better to combine the two actions into a single
enumerated histogram with two buckets.

Histograms are better supported by our dashboards (e.g. allow filters) and are
also more efficient.

+  <owner>jaekyun@chromium.org</owner>
+  <description>
+    A renderer process is crashed in the background while an application is in
+    the foreground.
+  </description>
+</action>
+
 <action name="MobileBeamCallbackSuccess">
   <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="MobileBeamInvalidAppState">
   <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 5015 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>