alloy: Use Chrome JS dialogs on Windows/Linux (fixes issue #3316)

libcef/browser/alloy/dialogs/alloy_javascript_dialog_manager_delegate.cc

@@ -0,0 +1,58 @@
+// Copyright 2022 The Chromium Embedded Framework Authors.
+// Portions copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "libcef/browser/alloy/dialogs/alloy_javascript_dialog_manager_delegate.h"
+
+#include "libcef/browser/browser_host_base.h"
+
+#include "base/logging.h"
+
+namespace {
+
+class AlloyJavaScriptTabModalDialogManagerDelegateDesktop
+    : public JavaScriptTabModalDialogManagerDelegateDesktop {
+ public:
+  explicit AlloyJavaScriptTabModalDialogManagerDelegateDesktop(
+      content::WebContents* web_contents)
+      : JavaScriptTabModalDialogManagerDelegateDesktop(web_contents),
+        web_contents_(web_contents) {}
+
+  AlloyJavaScriptTabModalDialogManagerDelegateDesktop(
+      const AlloyJavaScriptTabModalDialogManagerDelegateDesktop&) = delete;
+  AlloyJavaScriptTabModalDialogManagerDelegateDesktop& operator=(
+      const AlloyJavaScriptTabModalDialogManagerDelegateDesktop&) = delete;
+
+  // javascript_dialogs::TabModalDialogManagerDelegate methods:
+  void WillRunDialog() override {}
+
+  void DidCloseDialog() override {}
+
+  void SetTabNeedsAttention(bool attention) override {}
+
+  bool IsWebContentsForemost() override {
+    if (auto browser =
+            CefBrowserHostBase::GetBrowserForContents(web_contents_)) {
+      return browser->IsVisible();
+    }
+    return false;
+  }
+
+  bool IsApp() override { return false; }
+
+ private:
+  // The WebContents for the tab over which the dialog will be modal. This may
+  // be different from the WebContents that requested the dialog, such as with
+  // Chrome app <webview>s.
+  raw_ptr<content::WebContents> web_contents_;
+};
+
+}  // namespace
+
+std::unique_ptr<JavaScriptTabModalDialogManagerDelegateDesktop>
+CreateAlloyJavaScriptTabModalDialogManagerDelegateDesktop(
+    content::WebContents* web_contents) {
+  return std::make_unique<AlloyJavaScriptTabModalDialogManagerDelegateDesktop>(
+      web_contents);
+}