LibWeb+WebContent: Add new console-message IPC calls

This patch introduces three new IPC calls for WebContent:

- `Client::did_output_js_console_message(index)`:
  Notifies the client that a new console message was logged.

- `Server::js_console_request_messages(start_index)`:
  Ask the server for console messages starting at the given index.

- `Client::did_get_js_console_messages(start_index, types, messages)`:
  Send the client the messages they requested.

This mechanism will replace the current
`Client::did_js_console_output()` call in the next few commits. This
will allow us to display messages in the console that happened before
the console was opened.

Userland/Libraries/LibWeb/OutOfProcessWebView.cpp

@@ -353,6 +353,18 @@ void OutOfProcessWebView::notify_server_did_js_console_output(const String& meth
         on_js_console_output(method, line);
 }
 
+void OutOfProcessWebView::notify_server_did_output_js_console_message(i32 message_index)
+{
+    if (on_js_console_new_message)
+        on_js_console_new_message(message_index);
+}
+
+void OutOfProcessWebView::notify_server_did_get_js_console_messages(i32 start_index, const Vector<String>& message_types, const Vector<String>& messages)
+{
+    if (on_get_js_console_messages)
+        on_get_js_console_messages(start_index, message_types, messages);
+}
+
 void OutOfProcessWebView::notify_server_did_change_favicon(const Gfx::Bitmap& favicon)
 {
     if (on_favicon_change)
@@ -439,6 +451,11 @@ void OutOfProcessWebView::js_console_input(const String& js_source)
     client().async_js_console_input(js_source);
 }
 
+void OutOfProcessWebView::js_console_request_messages(i32 start_index)
+{
+    client().async_js_console_request_messages(start_index);
+}
+
 void OutOfProcessWebView::run_javascript(StringView js_source)
 {
     client().async_run_javascript(js_source);

Userland/Libraries/LibWeb/OutOfProcessWebView.h

@@ -43,6 +43,7 @@ public:
 
     void js_console_initialize();
     void js_console_input(const String& js_source);
+    void js_console_request_messages(i32 start_index);
 
     void run_javascript(StringView);
 
@@ -75,6 +76,8 @@ public:
     void notify_server_did_get_dom_tree(const String& dom_tree);
     void notify_server_did_get_dom_node_properties(i32 node_id, String const& specified_style, String const& computed_style);
     void notify_server_did_js_console_output(const String& method, const String& line);
+    void notify_server_did_output_js_console_message(i32 message_index);
+    void notify_server_did_get_js_console_messages(i32 start_index, Vector<String> const& message_types, Vector<String> const& messages);
     void notify_server_did_change_favicon(const Gfx::Bitmap& favicon);
     String notify_server_did_request_cookie(Badge<WebContentClient>, const URL& url, Cookie::Source source);
     void notify_server_did_set_cookie(Badge<WebContentClient>, const URL& url, const Cookie::ParsedCookie& cookie, Cookie::Source source);

Userland/Libraries/LibWeb/WebContentClient.cpp

@@ -151,6 +151,16 @@ void WebContentClient::did_js_console_output(String const& method, String const&
     m_view.notify_server_did_js_console_output(method, line);
 }
 
+void WebContentClient::did_output_js_console_message(i32 message_index)
+{
+    m_view.notify_server_did_output_js_console_message(message_index);
+}
+
+void WebContentClient::did_get_js_console_messages(i32 start_index, Vector<String> const& message_types, Vector<String> const& messages)
+{
+    m_view.notify_server_did_get_js_console_messages(start_index, message_types, messages);
+}
+
 void WebContentClient::did_request_alert(String const& message)
 {
     m_view.notify_server_did_request_alert({}, message);

Userland/Libraries/LibWeb/WebContentClient.h

@@ -52,6 +52,8 @@ private:
     virtual void did_get_dom_tree(String const&) override;
     virtual void did_get_dom_node_properties(i32 node_id, String const& specified_style, String const& computed_style) override;
     virtual void did_js_console_output(String const&, String const&) override;
+    virtual void did_output_js_console_message(i32 message_index) override;
+    virtual void did_get_js_console_messages(i32 start_index, Vector<String> const& message_types, Vector<String> const& messages) override;
     virtual void did_change_favicon(Gfx::ShareableBitmap const&) override;
     virtual void did_request_alert(String const&) override;
     virtual Messages::WebContentClient::DidRequestConfirmResponse did_request_confirm(String const&) override;

Userland/Libraries/LibWeb/WebViewHooks.h

@@ -30,6 +30,8 @@ public:
     Function<void(const String&)> on_get_dom_tree;
     Function<void(i32 node_id, String const& specified_style, String const& computed_style)> on_get_dom_node_properties;
     Function<void(const String& method, const String& line)> on_js_console_output;
+    Function<void(i32 message_id)> on_js_console_new_message;
+    Function<void(i32 start_index, Vector<String> const& message_types, Vector<String> const& messages)> on_get_js_console_messages;
     Function<String(const URL& url, Cookie::Source source)> on_get_cookie;
     Function<void(const URL& url, const Cookie::ParsedCookie& cookie, Cookie::Source source)> on_set_cookie;
 };