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 ce92b4a4b9b3383ccff650ee1c5c910ff9b38b75..1c530ac248575e51016bb51730b6868dbeeeb9ef 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -15288,6 +15288,34 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Enterprise.RetrievePolicyResponse.Device"
+    enum="EnterpriseRetrievePolicyResponseType">
+  <owner>emaxx@chromium.org</owner>
+  <owner>igorcov@chromium.org</owner>
+  <summary>
+    On Chrome OS, the response obtained to retrieve device policy request.
+  </summary>
+</histogram>
+
+<histogram name="Enterprise.RetrievePolicyResponse.DeviceLocalAccount"
+    enum="EnterpriseRetrievePolicyResponseType">
+  <owner>emaxx@chromium.org</owner>
+  <owner>igorcov@chromium.org</owner>
+  <summary>
+    On Chrome OS, the response obtained to retrieve device local account policy
+    request.
+  </summary>
+</histogram>
+
+<histogram name="Enterprise.RetrievePolicyResponse.User"

[Alexei Svitkine (slow), 2017/04/25 14:41:41]

Please use the histogram_suffixes construct - since
User/Device/DeviceLocalAccount are specializations of the metric. The comments
at the top of this file give you an example how to use it - and you can specify
separator="."

[igorcov, 2017/04/26 11:34:31]

Done.

+    enum="EnterpriseRetrievePolicyResponseType">
+  <owner>emaxx@chromium.org</owner>
+  <owner>igorcov@chromium.org</owner>
+  <summary>
+    On Chrome OS, 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.
@@ -92696,6 +92724,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="18" label="Store Failed">Caching a policy to disk failed.</int>
 </enum>
 
+<enum name="EnterpriseRetrievePolicyResponseType" type="int">
+  <summary>
+    Status codes produced by SessionManagerClient for policy retrieval requests.
+    Corresponds to RetrievePolicyResponseType in
+    chromeos/dbus/session_manager_client.h.
+  </summary>
+  <int value="0" label="Other type of error on retrieve policy request"/>
+  <int value="1" label="Success"/>
+  <int value="2" label="Retrieve request issued before session started"/>
+  <int value="3" label="Failed to retrieve policy data in session manager"/>
+</enum>
+
 <enum name="EnterpriseUploadJobSuccess" type="int">
   <summary>
     Number of UploadJob retries as defined in