LibWeb+WebContent: Port DumpLayoutTree to OutOfProcessWebView

This required adding a simple OOPWV::dump_layout_tree() API that
synchronously requests a dump of the layout tree from the WebContent
process.

Userland/Libraries/LibWeb/DumpLayoutTree/main.cpp

@@ -7,9 +7,7 @@
 #include <LibCore/ArgsParser.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/Window.h>
-#include <LibWeb/Dump.h>
+#include <LibWeb/OutOfProcessWebView.h>
-#include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <unistd.h>
 
 int main(int argc, char** argv)
@@ -19,22 +17,11 @@ int main(int argc, char** argv)
     window->set_title("DumpLayoutTree");
     window->resize(800, 600);
     window->show();
-    auto& web_view = window->set_main_widget<Web::InProcessWebView>();
+    auto& web_view = window->set_main_widget<Web::OutOfProcessWebView>();
     web_view.load(URL::create_with_file_protocol(argv[1]));
     web_view.on_load_finish = [&](auto&) {
-        auto* document = web_view.document();
+        auto dump = web_view.dump_layout_tree();
-        if (!document) {
+        write(STDOUT_FILENO, dump.characters(), dump.length() + 1);
-            warnln("No document.");
-            _exit(1);
-        }
-        auto* layout_root = document->layout_node();
-        if (!layout_root) {
-            warnln("No layout tree.");
-            _exit(1);
-        }
-        StringBuilder builder;
-        Web::dump_tree(builder, *layout_root);
-        write(STDOUT_FILENO, builder.string_view().characters_without_null_termination(), builder.length());
         _exit(0);
     };
     return app->exec();

Userland/Libraries/LibWeb/OutOfProcessWebView.cpp

@@ -460,4 +460,9 @@ void OutOfProcessWebView::select_all()
     client().async_select_all();
 }
 
+String OutOfProcessWebView::dump_layout_tree()
+{
+    return client().dump_layout_tree();
+}
+
 }

Userland/Libraries/LibWeb/OutOfProcessWebView.h

@@ -49,6 +49,8 @@ public:
     String selected_text();
     void select_all();
 
+    String dump_layout_tree();
+
     void notify_server_did_layout(Badge<WebContentClient>, const Gfx::IntSize& content_size);
     void notify_server_did_paint(Badge<WebContentClient>, i32 bitmap_id);
     void notify_server_did_invalidate_content_rect(Badge<WebContentClient>, const Gfx::IntRect&);

Userland/Services/WebContent/ClientConnection.cpp

@@ -321,4 +321,17 @@ void ClientConnection::select_all()
     page().client().page_did_change_selection();
 }
 
+Messages::WebContentServer::DumpLayoutTreeResponse ClientConnection::dump_layout_tree()
+{
+    auto* document = page().top_level_browsing_context().document();
+    if (!document)
+        return String { "(no DOM tree)" };
+    auto* layout_root = document->layout_node();
+    if (!layout_root)
+        return String { "(no layout tree)" };
+    StringBuilder builder;
+    Web::dump_tree(builder, *layout_root);
+    return builder.to_string();
+}
+
 }

Userland/Services/WebContent/ClientConnection.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -54,6 +54,7 @@ private:
     virtual void inspect_dom_tree() override;
     virtual Messages::WebContentServer::InspectDomNodeResponse inspect_dom_node(i32) override;
     virtual Messages::WebContentServer::GetHoveredNodeIdResponse get_hovered_node_id() override;
+    virtual Messages::WebContentServer::DumpLayoutTreeResponse dump_layout_tree() override;
 
     virtual void js_console_input(String const&) override;
     virtual void run_javascript(String const&) override;

Userland/Services/WebContent/WebContentServer.ipc

@@ -34,6 +34,8 @@ endpoint WebContentServer
 
     run_javascript(String js_source) =|
 
+    dump_layout_tree() => (String dump)
+
     get_selected_text() => (String selection)
     select_all() =|
 }