Ladybird: Add IPC call for creating a new child tab

This will be used for choosing a navigable that requires opening a new
tab or new window. Such as calls to window.open(), or specific WebDriver
calls.

Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp

@@ -499,7 +499,7 @@ JS::GCPtr<DOM::Node> BrowsingContext::currently_focused_area()
 }
 
 // https://html.spec.whatwg.org/#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name
-BrowsingContext::ChosenBrowsingContext BrowsingContext::choose_a_browsing_context(StringView name, TokenizedFeature::NoOpener no_opener, ActivateTab activate_tab)
+BrowsingContext::ChosenBrowsingContext BrowsingContext::choose_a_browsing_context(StringView name, TokenizedFeature::NoOpener no_opener, ActivateTab)
 {
     // The rules for choosing a browsing context, given a browsing context name name, a browsing context current, and
     // a boolean noopener are as follows:
@@ -591,8 +591,8 @@ BrowsingContext::ChosenBrowsingContext BrowsingContext::choose_a_browsing_contex
 
             // 3. If noopener is true, then set chosen to the result of creating a new top-level browsing context.
             if (no_opener == TokenizedFeature::NoOpener::Yes) {
-                auto handle = m_page->client().page_did_request_new_tab(activate_tab);
-                chosen = RemoteBrowsingContext::create_a_new_remote_browsing_context(handle);
+                // FIXME: This is completely wrong, but all of this should be removed in favor of choose_a_navigable
+                chosen = this;
             }
 
             // 4. Otherwise:

Userland/Libraries/LibWeb/HTML/WebViewHints.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibIPC/Decoder.h>
+#include <LibIPC/Encoder.h>
+#include <LibWeb/HTML/WebViewHints.h>
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder& encoder, ::Web::HTML::WebViewHints const& data_holder)
+{
+    TRY(encoder.encode(data_holder.popup));
+    TRY(encoder.encode(data_holder.width));
+    TRY(encoder.encode(data_holder.height));
+    TRY(encoder.encode(data_holder.screen_x));
+    TRY(encoder.encode(data_holder.screen_y));
+
+    return {};
+}
+
+template<>
+ErrorOr<::Web::HTML::WebViewHints> decode(Decoder& decoder)
+{
+    auto popup = TRY(decoder.decode<bool>());
+    auto width = TRY(decoder.decode<Optional<Web::DevicePixels>>());
+    auto height = TRY(decoder.decode<Optional<Web::DevicePixels>>());
+    auto screen_x = TRY(decoder.decode<Optional<Web::DevicePixels>>());
+    auto screen_y = TRY(decoder.decode<Optional<Web::DevicePixels>>());
+
+    return ::Web::HTML::WebViewHints {
+        .popup = popup,
+        .width = width,
+        .height = height,
+        .screen_x = screen_x,
+        .screen_y = screen_y,
+    };
+}
+
+}

Userland/Libraries/LibWeb/HTML/WebViewHints.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Optional.h>
+#include <AK/Types.h>
+#include <LibIPC/Forward.h>
+#include <LibWeb/PixelUnits.h>
+
+namespace Web::HTML {
+
+struct WebViewHints {
+    bool popup = false;
+    Optional<DevicePixels> width = {};
+    Optional<DevicePixels> height = {};
+    Optional<DevicePixels> screen_x = {};
+    Optional<DevicePixels> screen_y = {};
+};
+
+}
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder&, Web::HTML::WebViewHints const&);
+
+template<>
+ErrorOr<Web::HTML::WebViewHints> decode(Decoder&);
+
+}