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

chrome/browser/chromeos/arc/arc_auth_context.cc

Index: chrome/browser/chromeos/arc/arc_auth_context.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_context.cc b/chrome/browser/chromeos/arc/arc_auth_context.cc
index dc0e829e1a4b82b2e991210c4d8abf63a6292819..99d78b3e6723b584ed0d6a8b4920df17935194b2 100644
--- a/chrome/browser/chromeos/arc/arc_auth_context.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_context.cc
@@ -6,10 +6,12 @@
 
 #include "base/callback_helpers.h"
 #include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/arc/arc_support_host.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
+#include "chrome/browser/signin/signin_ui_util.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_manager_base.h"
 #include "content/public/browser/browser_context.h"
@@ -42,6 +44,9 @@ ArcAuthContext::ArcAuthContext(Profile* profile) {
       SigninManagerFactory::GetForProfile(profile);
   CHECK(token_service_ && signin_manager);
   account_id_ = signin_manager->GetAuthenticatedAccountId();
+
+  full_account_id_ = base::UTF16ToUTF8(
+      signin_ui_util::GetAuthenticatedUsername(signin_manager));
 }
 
 ArcAuthContext::~ArcAuthContext() {