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

chrome/browser/chromeos/arc/arc_auth_context.h

Index: chrome/browser/chromeos/arc/arc_auth_context.h
diff --git a/chrome/browser/chromeos/arc/arc_auth_context.h b/chrome/browser/chromeos/arc/arc_auth_context.h
index a359366ca247ed4767dea0cc5563a3b4bc3c28ee..c0aee9cedc78a9d7766de409d19575c78891eeba 100644
--- a/chrome/browser/chromeos/arc/arc_auth_context.h
+++ b/chrome/browser/chromeos/arc/arc_auth_context.h
@@ -36,6 +36,10 @@ class ArcAuthContext : public UbertokenConsumer,
   ProfileOAuth2TokenService* token_service() { return token_service_; }
   const std::string& account_id() const { return account_id_; }
 
+  // Returns full account id, including dots that are removed in CrOS for
+  // the default account id.
+  const std::string& full_account_id() const { return full_account_id_; }
+
   // Prepares the context. Calling while an inflight operation exists will
   // cancel the inflight operation.
   // On completion, |context| is passed to the callback. On error, |context|
@@ -65,6 +69,7 @@ class ArcAuthContext : public UbertokenConsumer,
   // Unowned pointer.
   ProfileOAuth2TokenService* token_service_;
   std::string account_id_;
+  std::string full_account_id_;
 
   // Owned by content::BrowserContent. Used to isolate cookies for auth server
   // communication and shared with ARC OptIn UI platform app.