Add CheckAndroidManagement to ARC sign-in flow.

chrome/browser/chromeos/arc/arc_optin_uma.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_OPTIN_UMA_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_OPTIN_UMA_H_
 
 namespace arc {
 
 // These enums are used to define the buckets for an enumerated UMA histogram
 // and need to be synced with histograms.xml
 enum class OptInActionType : int {
   OPTED_OUT = 0,               // Arc was opted out by user.
   OPTED_IN = 1,                // Arc was opted in by user.
   NOTIFICATION_ACCEPTED = 2,   // Arc OptIn notification was accepted.
   NOTIFICATION_DECLINED = 3,   // Arc OptIn notification was declined.
   NOTIFICATION_TIMED_OUT = 4,  // Arc OptIn notification was timed out.
   RETRY = 5,                   // User asked to retry OptIn.
   SIZE,                        // The size of this enum; keep last.
 };
 
 enum class OptInCancelReason {
-  USER_CANCEL = 0,                // Canceled by user.
-  UNKNOWN_ERROR = 1,              // Unclassified failure.
-  NETWORK_ERROR = 2,              // Network failure.
-  SERVICE_UNAVAILABLE = 3,        // GMS Services are not available.
-  BAD_AUTHENTICATION = 4,         // Bad authentication returned by server.
-  GMS_CORE_NOT_AVAILABLE = 5,     // GMS Core is not available.
-  CLOUD_PROVISION_FLOW_FAIL = 6,  // Cloud provision flow failed.
-  SIZE,                           // The size of this enum; keep last.
+  USER_CANCEL = 0,                 // Canceled by user.
+  UNKNOWN_ERROR = 1,               // Unclassified failure.
+  NETWORK_ERROR = 2,               // Network failure.
+  SERVICE_UNAVAILABLE = 3,         // GMS Services are not available.
+  BAD_AUTHENTICATION = 4,          // Bad authentication returned by server.
+  GMS_CORE_NOT_AVAILABLE = 5,      // GMS Core is not available.
+  CLOUD_PROVISION_FLOW_FAIL = 6,   // Cloud provision flow failed.
+  ANDROID_MANAGEMENT_ENABLED = 7,  // Android management is enabled for user.

[bartfab (slow), 2016/04/18 15:06:15]

Nit 1: s/enabled/required/
Nit 2: consider s/ENABLED/REQUIRED/

[Polina Bondarenko, 2016/04/20 13:37:45]

Done.

+  SIZE,                            // The size of this enum; keep last.
 };
 
 void UpdateOptInActionUMA(OptInActionType type);
 void UpdateOptInCancelUMA(OptInCancelReason reason);
 void UpdateEnabledStateUMA(bool enabled);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_OPTIN_UMA_H_