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

components/arc/common/auth.mojom

Index: components/arc/common/auth.mojom
diff --git a/components/arc/common/auth.mojom b/components/arc/common/auth.mojom
index c0617259ee98425fbc9df79903c4b6c997e50f35..65ff44e2dddb01934447fc9f15d45c59949bb87b 100644
--- a/components/arc/common/auth.mojom
+++ b/components/arc/common/auth.mojom
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Next MinVersion: 9
+// Next MinVersion: 10
 
 module arc.mojom;
 
@@ -66,6 +66,25 @@ enum ArcSignInFailureReason {
   [MinVersion=8] NO_NETWORK_CONNECTION = 15,
 };
 
+// These values describe account check status.
+[Extensible]
+enum AccountCheckStatus {
+    // Checked account exists and is up to date.
+    [MinVersion=9] UP_TO_DATE = 0,
+
+    // Checked account is new in the system.
+    [MinVersion=9] NEW = 1,
+
+    // Checked account exists but need to be reauthorized.
+    [MinVersion=9] NEED_REAUTH = 2,
+
+    // Checked account exists but it is in unknown state.
+    [MinVersion=9] UNKNOWN = 3,
+
+    // Account check has failed.
+    [MinVersion=9] CHECK_FAILED = 4,
+};
+
 // These values describe the type of the Chrome account to provision.
 [Extensible]
 enum ChromeAccountType {
@@ -97,10 +116,16 @@ enum MetricsType {
 
   // Duration of waiting for sign-in completed in milliseconds.
   SIGNIN_TIME_MILLISECONDS = 3,
+
+  // Duration of checking the status of account.
+  [MinVersion=9] ACCOUNT_CHECK_MILLISECONDS = 4,
 };
 
 // The necessary information for Android to sign in and provision itself.
 struct AccountInfo {
+  // Name of account, used to map to existing Android account.
+  [MinVersion=9] string? account_name@4;
+
   // The authorization code that can be used in Android to sign in when
   // account_type is USER_ACCOUNT or ROBOT_ACCOUNT. If it is null in these
   // cases, sign-in will be skipped.
@@ -118,7 +143,7 @@ struct AccountInfo {
   bool is_managed@2;
 };
 
-// Next Method ID: 9.
+// Next Method ID: 10.
 interface AuthHost {
   // Notifies Chrome that the sign-in is completed successfully.
   [MinVersion=2] OnSignInComplete@2();
@@ -132,6 +157,9 @@ interface AuthHost {
   // Reports metrics to Chrome to be recorded in UMA.
   [MinVersion=7] ReportMetrics@8(MetricsType metrics_type, int32 value);
 
+  // Reports result of account check.
+  [MinVersion=9] ReportAccountCheckStatus@9(AccountCheckStatus status);
+
   // Deprecated methods:
 
   // Returns an authorization code, which can be used to sign in.