arc: Pass auth token from Chrome to ARC instance.

chrome/browser/chromeos/arc/arc_auth_service_impl.cc

Index: chrome/browser/chromeos/arc/arc_auth_service_impl.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service_impl.cc b/chrome/browser/chromeos/arc/arc_auth_service_impl.cc
index 88174ff2f133d145b308ae8c8bd0281f73f7a922..f1e8f899d98010f1cb18f7b48f6954b410143524 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service_impl.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service_impl.cc
@@ -6,6 +6,9 @@
 
 #include <utility>
 
+#include "components/arc/arc_service_manager.h"
+#include "components/arc/opt_in/arc_opt_in_manager.h"
+
 namespace arc {
 
 ArcAuthServiceImpl::ArcAuthServiceImpl() : binding_(this) {}
@@ -25,8 +28,8 @@ void ArcAuthServiceImpl::OnAuthInstanceReady() {
 }
 
 void ArcAuthServiceImpl::GetAuthCode(const GetAuthCodeCallback& callback) {
-  // TODO(victorhsieh): request auth code from LSO (crbug.com/571146).
-  callback.Run(mojo::String("fake auth code from ArcAuthService in Chrome"));
+  callback.Run(mojo::String(
+      ArcServiceManager::Get()->arc_opt_in_manager()->GetAuthToken()));
 }
 
 }  // namespace arc