arc: Skip GMS Sign-In in case Android is already signed-in.

chrome/browser/chromeos/arc/arc_optin_uma.h

Index: chrome/browser/chromeos/arc/arc_optin_uma.h
diff --git a/chrome/browser/chromeos/arc/arc_optin_uma.h b/chrome/browser/chromeos/arc/arc_optin_uma.h
index 3b5844f058e4efa9a4723e6087d9f5fe3c3fe038..bdbf7a9f772da77efc4d0a35a0fbea24111f123b 100644
--- a/chrome/browser/chromeos/arc/arc_optin_uma.h
+++ b/chrome/browser/chromeos/arc/arc_optin_uma.h
@@ -119,6 +119,26 @@ enum class ProvisioningResult : int {
   SIZE,
 };
 
+enum class AccountCheckStatus : int {
+  // Checked account exists and is up to date.
+  UP_TO_DATE = 0,
+
+  // Checked account is new in the system.
+  NEW = 1,
+
+  // Checked account exists but need to be reauthorized.
+  NEED_REAUTH = 2,
+
+  // Checked account exists but it is in unknown state.
+  UNKNOWN = 3,
+
+  // Account check has failed.
+  CHECK_FAILED = 4,
+
+  // The size of this enum; keep last.
+  SIZE,
+};
+
 void UpdateOptInActionUMA(OptInActionType type);
 void UpdateOptInCancelUMA(OptInCancelReason reason);
 void UpdateEnabledStateUMA(bool enabled);
@@ -129,6 +149,7 @@ void UpdateProvisioningTiming(const base::TimeDelta& elapsed_time,
 void UpdateSilentAuthCodeUMA(OptInSilentAuthCode state);
 void UpdateAuthTiming(const char* histogram_name, base::TimeDelta elapsed_time);
 void UpdateAuthCheckinAttempts(int32_t num_attempts);
+void UpdateAuthAccountCheckStatus(AccountCheckStatus status);
 
 // Outputs the stringified |result| to |os|. This is only for logging purposes.
 std::ostream& operator<<(std::ostream& os, const ProvisioningResult& result);