Browser+LibWeb+WebContent: Make the "Debug" menu work in multi-process

This patch adds an IPC call for debugging requests. It's stringly typed
and very simple, and allows us to easily implement all the features in
the Browser's Debug menu.

5 files changed, 50 insertions, 0 deletions

diff --git a/Userland/Services/WebContent/ClientConnection.cpp b/Userland/Services/WebContent/ClientConnection.cpp
index 01af0de4ec..b41e35cb9b 100644
--- a/Userland/Services/WebContent/ClientConnection.cpp
+++ b/Userland/Services/WebContent/ClientConnection.cpp
@@ -28,11 +28,21 @@
 #include <AK/Debug.h>
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/SystemTheme.h>
+#include <LibJS/Heap/Heap.h>
+#include <LibJS/Runtime/VM.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/Dump.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Page/Frame.h>
 #include <WebContent/ClientConnection.h>
 #include <WebContent/PageHost.h>
 #include <WebContent/WebContentClientEndpoint.h>
 #include <pthread.h>
 
+namespace Web::DOM {
+extern JS::VM& main_thread_vm();
+}
+
 namespace WebContent {
 
 static HashMap<int, RefPtr<ClientConnection>> s_connections;
@@ -165,4 +175,37 @@ void ClientConnection::handle(const Messages::WebContentServer::KeyDown& message
     page().handle_keydown((KeyCode)message.key(), message.modifiers(), message.code_point());
 }
 
+void ClientConnection::handle(const Messages::WebContentServer::DebugRequest& message)
+{
+    if (message.request() == "dump-dom-tree") {
+        if (auto* doc = page().main_frame().document())
+            Web::dump_tree(*doc);
+    }
+
+    if (message.request() == "dump-layout-tree") {
+        if (auto* doc = page().main_frame().document()) {
+            if (auto* icb = doc->layout_node())
+                Web::dump_tree(*icb);
+        }
+    }
+
+    if (message.request() == "dump-style-sheets") {
+        if (auto* doc = page().main_frame().document()) {
+            for (auto& sheet : doc->style_sheets().sheets()) {
+                Web::dump_sheet(sheet);
+            }
+        }
+    }
+
+    if (message.request() == "collect-garbage") {
+        ::Web::DOM::main_thread_vm().heap().collect_garbage(JS::Heap::CollectionType::CollectGarbage, true);
+    }
+
+    if (message.request() == "set-line-box-borders") {
+        bool state = message.argument() == "on";
+        m_page_host->set_should_show_line_box_borders(state);
+        page().main_frame().set_needs_display(page().main_frame().viewport_rect());
+    }
+}
+
 }
diff --git a/Userland/Services/WebContent/ClientConnection.h b/Userland/Services/WebContent/ClientConnection.h
index 34a13713f3..39faf16165 100644
--- a/Userland/Services/WebContent/ClientConnection.h
+++ b/Userland/Services/WebContent/ClientConnection.h
@@ -62,6 +62,7 @@ private:
     virtual void handle(const Messages::WebContentServer::KeyDown&) override;
     virtual void handle(const Messages::WebContentServer::AddBackingStore&) override;
     virtual void handle(const Messages::WebContentServer::RemoveBackingStore&) override;
+    virtual void handle(const Messages::WebContentServer::DebugRequest&) override;
 
     void flush_pending_paint_requests();
 
diff --git a/Userland/Services/WebContent/PageHost.cpp b/Userland/Services/WebContent/PageHost.cpp
index f4a47e1259..d37ff61054 100644
--- a/Userland/Services/WebContent/PageHost.cpp
+++ b/Userland/Services/WebContent/PageHost.cpp
@@ -93,6 +93,7 @@ void PageHost::paint(const Gfx::IntRect& content_rect, Gfx::Bitmap& target)
     painter.translate(-content_rect.x(), -content_rect.y());
 
     Web::PaintContext context(painter, palette(), Gfx::IntPoint());
+    context.set_should_show_line_box_borders(m_should_show_line_box_borders);
     context.set_viewport_rect(content_rect);
     layout_root->paint_all_phases(context);
 }
diff --git a/Userland/Services/WebContent/PageHost.h b/Userland/Services/WebContent/PageHost.h
index 6983421840..580685cfdb 100644
--- a/Userland/Services/WebContent/PageHost.h
+++ b/Userland/Services/WebContent/PageHost.h
@@ -48,6 +48,8 @@ public:
     void set_palette_impl(const Gfx::PaletteImpl&);
     void set_viewport_rect(const Gfx::IntRect&);
 
+    void set_should_show_line_box_borders(bool b) { m_should_show_line_box_borders = b; }
+
 private:
     // ^PageClient
     virtual bool is_multi_process() const override { return true; }
@@ -75,6 +77,7 @@ private:
     ClientConnection& m_client;
     NonnullOwnPtr<Web::Page> m_page;
     RefPtr<Gfx::PaletteImpl> m_palette_impl;
+    bool m_should_show_line_box_borders { false };
 };
 
 }
diff --git a/Userland/Services/WebContent/WebContentServer.ipc b/Userland/Services/WebContent/WebContentServer.ipc
index e025e0b0cd..81620f7ecf 100644
--- a/Userland/Services/WebContent/WebContentServer.ipc
+++ b/Userland/Services/WebContent/WebContentServer.ipc
@@ -18,4 +18,6 @@ endpoint WebContentServer = 89
     MouseUp(Gfx::IntPoint position, unsigned button, unsigned buttons, unsigned modifiers) =|
 
     KeyDown(i32 key, unsigned modifiers, u32 code_point) =|
+
+    DebugRequest(String request, String argument) =|
 }