Correctly propagate focus to OOBE webview

Bug: 1016998
Change-Id: Icfdc5aa90646796e9bd7f09806caf16a7ab050c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893283Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711283}

chrome/browser/chromeos/login/ui/oobe_ui_dialog_delegate.cc

@@ -164,6 +164,8 @@ class LayoutWidgetDelegateView : public views::WidgetDelegateView {
     }
   }
 
+  View* GetInitiallyFocusedView() override { return oobe_view_; }
+
  private:
   OobeUIDialogDelegate* dialog_delegate_ = nullptr;  // Owned by us.
   OobeWebDialogView* oobe_view_ = nullptr;  // Owned by views hierarchy.