frontend: Add frontend responder for web browser

src/core/frontend/applets/web_browser.cpp

+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/logging/log.h"
+#include "core/frontend/applets/web_browser.h"
+
+namespace Core::Frontend {
+
+WebBrowserApplet::~WebBrowserApplet() = default;
+
+DefaultWebBrowserApplet::~DefaultWebBrowserApplet() = default;
+
+void DefaultWebBrowserApplet::OpenPage(std::string_view filename,
+                                       std::function<void()> unpack_romfs_callback,
+                                       std::function<void()> finished_callback) const {
+    LOG_INFO(Service_AM,
+             "(STUBBED) called - No suitable web browser implementation found to open website page "
+             "at '{}'!",
+             filename);
+    finished_callback();
+}
+
+} // namespace Core::Frontend

src/core/frontend/applets/web_browser.h

+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <string_view>
+
+namespace Core::Frontend {
+
+class WebBrowserApplet {
+public:
+    virtual ~WebBrowserApplet();
+
+    virtual void OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
+                          std::function<void()> finished_callback) const = 0;
+};
+
+class DefaultWebBrowserApplet final : public WebBrowserApplet {
+public:
+    ~DefaultWebBrowserApplet() override;
+
+    void OpenPage(std::string_view url, std::function<void()> unpack_romfs_callback,
+                  std::function<void()> finished_callback) const override;
+};
+
+} // namespace Core::Frontend