LibWeb+LibWebView+WebContent: Add an Inspector IPC to execute JavaScript

The Inspector will have an <input> element to execute user-provided JS.
This adds an IDL method and IPC to forward that JS from the Inspector
WebView to the Inspector client.

Userland/Libraries/LibWeb/Internals/Inspector.cpp

@@ -47,4 +47,10 @@ void Inspector::inspect_dom_node(i32 node_id, Optional<i32> const& pseudo_elemen
     }
 }
 
+void Inspector::execute_console_script(String const& script)
+{
+    if (auto* page = global_object().browsing_context()->page())
+        page->client().inspector_did_execute_console_script(script);
+}
+
 }

Userland/Libraries/LibWeb/Internals/Inspector.h

@@ -21,6 +21,8 @@ public:
     void inspector_loaded();
     void inspect_dom_node(i32 node_id, Optional<i32> const& pseudo_element);
 
+    void execute_console_script(String const& script);
+
 private:
     explicit Inspector(JS::Realm&);
 

Userland/Libraries/LibWeb/Internals/Inspector.idl

@@ -3,4 +3,6 @@
     undefined inspectorLoaded();
     undefined inspectDOMNode(long nodeID, optional long pseudoElement);
 
+    undefined executeConsoleScript(DOMString script);
+
 };

Userland/Libraries/LibWeb/Page/Page.h

@@ -265,6 +265,7 @@ public:
 
     virtual void inspector_did_load() { }
     virtual void inspector_did_select_dom_node([[maybe_unused]] i32 node_id, [[maybe_unused]] Optional<CSS::Selector::PseudoElement> const& pseudo_element) { }
+    virtual void inspector_did_execute_console_script([[maybe_unused]] String const& script) { }
 
 protected:
     virtual ~PageClient() = default;