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/Libraries/LibWebView/OutOfProcessWebView.h

@@ -71,6 +71,7 @@ public:
     String get_computed_value_for_element(i32 element_id, String const& property_name);
     String get_element_text(i32 element_id);
     String get_element_tag_name(i32 element_id);
+    Gfx::IntRect get_element_rect(i32 element_id);
 
     void set_content_filters(Vector<String>);
     void set_proxy_mappings(Vector<String> proxies, HashMap<String, size_t> mappings);