Implement cloud policy invalidations using the invalidation service framework.

tools/metrics/histograms/histograms.before.pretty-print.xml

 <!--

[Joao da Silva, 2013/07/23 20:44:47]

This file shouldn't be included.

[Steve Condie, 2013/07/24 01:42:04]

Done.

 Copyright 2013 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 used to generate a comprehensive list of Chrome histograms along
 with a detailed description for each histogram.
 
 Please pretty-print and validate your edits by running the pretty_print.py
@@ skipping 2385 matching lines @@
   </summary>
 </histogram>
 
 <histogram name="Enterprise.Policy" enum="EnterprisePolicyType">
   <summary>
     Events related to fetching, saving and loading user policies, and also
     device policies on ChromeOS.
   </summary>
 </histogram>
 
+<histogram name="Enterprise.PolicyInvalidations" enum="EnterprisePolicyInvalidations">
+  <summary>
+    Events for receiving different types of invalidations.
+  </summary>
+</histogram>
+
 <histogram name="Enterprise.PolicyLoadStatus" enum="EnterprisePolicyLoadStatus">
   <summary>
     Load status from the policy loaders which pull policy settings from the
     underlying platform, such as Windows Group Policy.
   </summary>
 </histogram>
 
+<histogram name="Enterprise.PolicyRefresh" enum="EnterprisePolicyRefresh">
+  <summary>
+    Events measuring effectiveness of refreshing policy when invalidations
+    are received from a service.
+  </summary>
+</histogram>
+
 <histogram name="Event.CoalescedCount.Mouse">
   <summary>Number of Mouse events coalesced.</summary>
 </histogram>
 
 <histogram name="Event.CoalescedCount.Touch">
   <summary>Number of Touch events coalesced.</summary>
 </histogram>
 
 <histogram name="Event.CoalescedLatency.Mouse" units="milliseconds">
   <summary>
@@ skipping 13514 matching lines @@
   <int value="5" label="WOW64_REDIRECTION_DISABLED">
     Trying with Wow64 redirection disabled.
   </int>
   <int value="6" label="READ_ERROR">
     Data read error, for example file reading errors.
   </int>
   <int value="7" label="TOO_BIG">Data too large to process.</int>
   <int value="8" label="PARSE_ERROR">Parse error.</int>
 </enum>
 
+<enum name="EnterprisePolicyInvalidations" type="int">
+  <summary>
+    Status codes representing types of policy invalidations received.
+  </summary>
+  <int value="0" label="PAYLOAD">
+    The invalidation contains a payload.
+  </int>
+  <int value="1" label="NO_PAYLOAD">
+    The invalidation contains no payload.
+  </int>
+</enum>
+
+<enum name="EnterprisePolicyRefresh" type="int">
+  <summary>
+    Status codes representing whether a policy was invalidated when it was
+    refreshed and whether the refresh resulted in changed policy values.
+  </summary>
+  <int value="0" label="CHANGED">
+    Policy was not invalidated; policy was changed.
+  </int>
+  <int value="1" label="UNCHANGED">
+    Policy was not invalidated; policy was unchanged.
+  </int>
+  <int value="2" label="INVALIDATED_CHANGED">
+    Policy was invalidated; policy was changed.
+  </int>
+  <int value="3" label="INVALIDATED_UNCHANGED">
+    Policy was invalidated; policy was unchanged.
+  </int>
+</enum>
+
 <enum name="EnterprisePolicyType" type="int">
   <summary>
     Result of Policy operations as defined in
     chrome/browser/policy/enterprise_metrics.h.
   </summary>
   <int value="0" label="Load Succeeded">
     A cached policy was successfully loaded from disk.
   </int>
   <int value="1" label="Load Failed">
     Reading a cached policy from disk failed.
@@ skipping 7458 matching lines @@
   <group name="Disabled" label="Neither extra webstore link is visible"/>
   <group name="FooterLink" label="Link in bottom right of footer"/>
   <group name="PlusIcon" label="Plus icon in apps page"/>
   <affected-histogram name="Extensions.AppLaunch"/>
   <affected-histogram name="NewTabPage.DefaultPageType"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>