Add handling for browsers created via Notifications Clients.openWindow()

[aKoheiNakamichi]

Describe the bug

When Clients.openWindow() is called in alloy style, cefsimple crashes.
In chrome style, the resulting window appears with a visually different style than expected.

To Reproduce
Steps to reproduce the behavior:

1. Open https://web-push-book.gauntface.com/demos/notification-examples/ using Chrome style.
2. Click 'Enable Notifications' and allow them.
3. Reopen the same URL using Alloy style. (This step can be skipped if you are testing in Chrome style).
4. Click 'OPEN WINDOW', then click the resulting notification.
5. A crash occurs or window open.

Expected behavior

The window should open using the same style as the original window.

Screenshots

With chrome style following window show.

Versions (please complete the following information):

• OS: Ubuntu24.04
• CEF Version: 145

Additional context

I attached the debug log. I tested with a locally built cefsimple.
crash.log

[magreenblatt]

Looks like a new way of creating windows that we were unaware of. Call stack from your log file:

[1736438:1736438:0213/124353.530112:FATAL:cef/tests/cefsimple/simple_handler.cc:67] Check failed: is_alloy_style_ ? CEF_RUNTIME_STYLE_ALLOY : CEF_RUNTIME_STYLE_CHROME == browser->GetHost()->GetRuntimeStyle() (2 vs. 1)
#0 0x77809b933f39 base::debug::CollectStackTrace() [../../base/debug/stack_trace_posix.cc:1048:7]
#1 0x77809b8f1b1a base::debug::StackTrace::StackTrace() [../../base/debug/stack_trace.cc:280:20]
#2 0x77809b8f1a85 base::debug::StackTrace::StackTrace() [../../base/debug/stack_trace.cc:275:28]
#3 0x77809b62d6a1 logging::LogMessage::Flush() [../../base/logging.cc:734:29]
#4 0x77809b62d5d7 logging::LogMessage::~LogMessage() [../../base/logging.cc:723:3]
#5 0x7780860d6423 cef_log [../../cef/libcef/common/base_impl.cc:219:3]
#6 0x6149d2be037b cef::logging::LogMessage::~LogMessage() [../../cef/libcef_dll/base/cef_logging.cc:477:3]
#7 0x6149d2bd3a62 SimpleHandler::OnAfterCreated() [../../cef/tests/cefsimple/simple_handler.cc:66:3]
#8 0x6149d2c33ca6 (anonymous namespace)::life_span_handler_on_after_created() [../../cef/libcef_dll/cpptoc/life_span_handler_cpptoc.cc:319:40]
#9 0x778085d2d657 CefLifeSpanHandler_0_CToCpp::OnAfterCreated() [../../cef/libcef_dll/ctocpp/life_span_handler_ctocpp.cc:215:3]
#10 0x778085e524e5 CefBrowserHostBase::OnAfterCreated() [../../cef/libcef/browser/browser_host_base.cc:1488:16]
#11 0x778085ea241b ChromeBrowserHostImpl::Attach() [../../cef/libcef/browser/chrome/chrome_browser_host_impl.cc:516:5]
#12 0x778085e9b4fd ChromeBrowserDelegate::CreateBrowserHost() [../../cef/libcef/browser/chrome/chrome_browser_delegate.cc:777:17]
#13 0x778085e9ad1e ChromeBrowserDelegate::SetAsDelegate() [../../cef/libcef/browser/chrome/chrome_browser_delegate.cc:275:3]
#14 0x778085e9a94c ChromeBrowserDelegate::OnWebContentsCreated() [../../cef/libcef/browser/chrome/chrome_browser_delegate.cc:237:3]
#15 0x778098bf2b1d BrowserWindowFeatures::OnWebContentsCreated() [../../chrome/browser/ui/browser_window/internal/browser_window_features.cc:884:19]
#16 0x7780b34143a9 (anonymous namespace)::CreateTargetContents() [../../chrome/browser/ui/browser_navigator.cc:516:33]
#17 0x7780b3412655 Navigate() [../../chrome/browser/ui/browser_navigator.cc:799:11]
#18 0x7780b3429971 ShowSingletonTabOverwritingNTP() [../../chrome/browser/ui/singleton_tabs.cc:96:3]
#19 0x7780b34299e5 ShowSingletonTabOverwritingNTP() [../../chrome/browser/ui/singleton_tabs.cc:73:3]
#20 0x7780b341db82 chrome::(anonymous namespace)::ShowSingletonTabIgnorePathOverwriteNTP() [../../chrome/browser/ui/chrome_pages.cc:118:3]
#21 0x7780b341ea27 chrome::ShowSettingsSubPageInTabbedBrowser() [../../chrome/browser/ui/chrome_pages.cc:498:3]
#22 0x7780b341e995 chrome::ShowSettingsSubPage() [../../chrome/browser/ui/chrome_pages.cc:475:3]
#23 0x7780b341ec15 chrome::ShowContentSettingsExceptions() [../../chrome/browser/ui/chrome_pages.cc:509:3]
#24 0x7780a32435c9 NotificationCommon::OpenNotificationSettings() [../../chrome/browser/notifications/notification_common.cc:60:3]
#25 0x7780a325ece5 PersistentNotificationHandler::OpenSettings() [../../chrome/browser/notifications/persistent_notification_handler.cc:359:3]
#26 0x7780a324f5af NotificationDisplayServiceImpl::ProcessNotificationOperation() [../../chrome/browser/notifications/notification_display_service_impl.cc:172:16]
#27 0x7780a3250511 NotificationDisplayServiceImpl::ProfileLoadedCallback() [../../chrome/browser/notifications/notification_display_service_impl.cc:325:20]

[magreenblatt]

The Chrome style behavior is correct for a browser window that is not specifically handled. Alloy style does not support chrome://settings, so that page is actually loading in Chrome style even when when running cefsimple as Alloy style (cefsimple code has the wrong assumptions).

[magreenblatt]

This falls into the same category as Chrome menu options such as "New window", etc. They all create Chrome UX style windows currently.