Abandon user sign in when policy is retrieved before session started

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 52f9a6bfe21b4cb28d55fca4f5483e2b27f2ead8..0793169a1df9f40d30bb26722b845b803ace7842 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -15229,6 +15229,26 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Enterprise.RetrieveDeviceLocalAccountPolicyResponse"

[emaxx, 2017/04/21 00:01:53]

nit: Maybe group all three histograms under a common prefix? E.g.:
Enterprise.RetrievePolicyResponse.Device,
Enterprise.RetrievePolicyResponse.User,
Enterprise.RetrievePolicyResponse.DeviceLocalAccount.

[igorcov, 2017/04/21 11:36:22]

Done.

+    enum="RetrievePolicyResponseType">
+  <owner>igorcov@chromium.org</owner>

[Daniel Erat, 2017/04/20 21:06:39]

please list additional owners for these if possible

[igorcov, 2017/04/21 11:36:22]

Done.

+  <summary>
+    The response obtained to retrieve device local account policy request.

[Daniel Erat, 2017/04/20 21:06:39]

make all of these start with "On Chrome OS, " to make it clear that they're
chrome-os-only

[igorcov, 2017/04/21 11:36:22]

Done.

+  </summary>
+</histogram>
+
+<histogram name="Enterprise.RetrieveDevicePolicyResponse"
+    enum="RetrievePolicyResponseType">
+  <owner>igorcov@chromium.org</owner>
+  <summary>The response obtained to retrieve device policy request.</summary>
+</histogram>
+
+<histogram name="Enterprise.RetrieveUserPolicyResponse"
+    enum="RetrievePolicyResponseType">
+  <owner>igorcov@chromium.org</owner>
+  <summary>The response obtained to retrieve user policy request.</summary>
+</histogram>
+
 <histogram name="Enterprise.SystemLogPIILeak" enum="SystemLogPIIType">
   <obsolete>
     Deprecated and removed from code as of 01/2016.
@@ -110384,6 +110404,13 @@ from previous Chrome versions.
   <int value="1" label="Cached StyleSheetContents was reused"/>
 </enum>
 
+<enum name="RetrievePolicyResponseType" type="int">

[emaxx, 2017/04/21 00:01:53]

nit: Many <enum>'s have a corresponding <summary>, which I think won't harm to
do. E.g.:
<summary>
  Status codes produced by SessionManagerClient for policy retrieval requests.
Corresponds to RetrievePolicyResponseType in
chromeos/dbus/session_manager_client.h.
</summary>

[emaxx, 2017/04/21 00:01:53]

nit: Please prepend the enum name with the word "Enteprise" (that's how it is
for the existing enterprise-related histograms).

[igorcov, 2017/04/21 11:36:22]

Done.

[igorcov, 2017/04/21 11:36:22]

Done.

+  <int value="0" label="Success"/>
+  <int value="1" label="Retrieve request issued before session started"/>
+  <int value="2" label="Failed to retrieve policy data in session manager"/>
+  <int value="3" label="Other type of error on retrieve policy request"/>
+</enum>
+
 <enum name="RevalidationPolicy" type="int">
   <int value="0" label="Use"/>
   <int value="1" label="Revalidate"/>