[cros] Initialize OOBE in parallel when boot animation is disabled.

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 090d14a1321e8d0012b9763d3cf5e4f8c317d8a0..6dee723f62dcaf2f2aab98fa59966f4d427aebd1 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -28,7 +28,7 @@ bool TestShellDelegate::IsUserLoggedIn() {
   return true;
 }
 
-bool TestShellDelegate::IsSessionStarted() {
+bool TestShellDelegate::IsSessionStarted() const {
   return true;
 }
 
@@ -44,6 +44,10 @@ bool TestShellDelegate::IsScreenLocked() const {
   return locked_;
 }
 
+bool TestShellDelegate::IsStatusAreaInitiallyVisible() const {
+  return true;
+}
+
 void TestShellDelegate::Shutdown() {
 }