LibWeb+WebContent: Implement asynchronous DOM Node properties call

This lets us "push" a new style-properties list to the DOM Inspector,
for example when JS changes the style of the inspected node.

Userland/Applications/Browser/Tab.cpp

@@ -281,6 +281,10 @@ Tab::Tab(BrowserWindow& window)
             m_dom_inspector_widget->set_dom_json(dom_tree);
     };
 
+    hooks().on_get_dom_node_properties = [this](auto node_id, auto& specified, auto& computed) {
+        m_dom_inspector_widget->set_dom_node_properties_json(node_id, specified, computed);
+    };
+
     hooks().on_js_console_output = [this](auto& method, auto& line) {
         if (m_console_window) {
             auto* console_widget = static_cast<ConsoleWidget*>(m_console_window->main_widget());

Userland/Libraries/LibWeb/OutOfProcessWebView.cpp

@@ -341,6 +341,12 @@ void OutOfProcessWebView::notify_server_did_get_dom_tree(const String& dom_tree)
         on_get_dom_tree(dom_tree);
 }
 
+void OutOfProcessWebView::notify_server_did_get_dom_node_properties(i32 node_id, String const& specified_style, String const& computed_style)
+{
+    if (on_get_dom_node_properties)
+        on_get_dom_node_properties(node_id, specified_style, computed_style);
+}
+
 void OutOfProcessWebView::notify_server_did_js_console_output(const String& method, const String& line)
 {
     if (on_js_console_output)

Userland/Libraries/LibWeb/OutOfProcessWebView.h

@@ -72,6 +72,7 @@ public:
     String notify_server_did_request_prompt(Badge<WebContentClient>, const String& message, const String& default_);
     void notify_server_did_get_source(const URL& url, const String& source);
     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_change_favicon(const Gfx::Bitmap& favicon);
     String notify_server_did_request_cookie(Badge<WebContentClient>, const URL& url, Cookie::Source source);

Userland/Libraries/LibWeb/WebContentClient.cpp

@@ -136,11 +136,16 @@ void WebContentClient::did_get_source(URL const& url, String const& source)
     m_view.notify_server_did_get_source(url, source);
 }
 
-void WebContentClient::did_get_dom_tree(const String& dom_tree)
+void WebContentClient::did_get_dom_tree(String const& dom_tree)
 {
     m_view.notify_server_did_get_dom_tree(dom_tree);
 }
 
+void WebContentClient::did_get_dom_node_properties(i32 node_id, String const& specified_style, String const& computed_style)
+{
+    m_view.notify_server_did_get_dom_node_properties(node_id, specified_style, computed_style);
+}
+
 void WebContentClient::did_js_console_output(String const& method, String const& line)
 {
     m_view.notify_server_did_js_console_output(method, line);

Userland/Libraries/LibWeb/WebContentClient.h

@@ -50,6 +50,7 @@ private:
     virtual void did_request_image_context_menu(Gfx::IntPoint const&, URL const&, String const&, unsigned, Gfx::ShareableBitmap const&) override;
     virtual void did_get_source(URL const&, String const&) override;
     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_change_favicon(Gfx::ShareableBitmap const&) override;
     virtual void did_request_alert(String const&) override;

Userland/Libraries/LibWeb/WebViewHooks.h

@@ -28,6 +28,7 @@ public:
     Function<void(DOM::Document*)> on_set_document;
     Function<void(const URL&, const String&)> on_get_source;
     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<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;

Userland/Services/WebContent/WebContentClient.ipc

@@ -28,6 +28,7 @@ endpoint WebContentClient
     did_request_prompt(String message, String default_) => (String response)
     did_get_source(URL url, String source) =|
     did_get_dom_tree(String dom_tree) =|
+    did_get_dom_node_properties(i32 node_id, String specified_style, String computed_style) =|
     did_js_console_output(String method, String line) =|
     did_change_favicon(Gfx::ShareableBitmap favicon) =|
     did_request_cookie(URL url, u8 source) => (String cookie)