LibWebView+WebConent: Add an IPC to get an element's absolute rect

Author: https://github.com/trflynn89
Commit: 995f3db384
Pull-request: https://github.com/SerenityOS/serenity/pull/15909
Reviewed-by: https://github.com/linusg ✅

Userland/Services/WebContent/WebContentServer.ipc

@@ -1,6 +1,7 @@
 #include <AK/URL.h>
 #include <LibIPC/File.h>
 #include <LibCore/AnonymousBuffer.h>
+#include <LibGfx/Rect.h>
 #include <LibGfx/ShareableBitmap.h>
 #include <LibWeb/CSS/PreferredColorScheme.h>
 #include <LibWeb/CSS/Selector.h>
@@ -47,6 +48,7 @@ endpoint WebContentServer
     get_computed_value_for_element(i32 element_id, String property_name) => (String computed_value)
     get_element_text(i32 element_id) => (String text)
     get_element_tag_name(i32 element_id) => (String tag_name)
+    get_element_rect(i32 element_id) => (Gfx::IntRect rect)
 
     webdriver_execute_script(String body, Vector<String> json_arguments, Optional<u64> timeout, bool async) => (Web::WebDriver::ExecuteScriptResultType result_type, String json_result)