LibWeb: Fire "keyup" events as well :^)

This was easy, now that we have KeyboardEvent.

Userland/Libraries/LibWeb/Page/EventHandler.cpp

@@ -460,6 +460,13 @@ bool EventHandler::handle_keydown(KeyCode key, unsigned modifiers, u32 code_poin
     return m_frame.active_document()->window().dispatch_event(move(event));
 }
 
+bool EventHandler::handle_keyup(KeyCode key, unsigned modifiers, u32 code_point)
+{
+    auto event = UIEvents::KeyboardEvent::create_from_platform_event(UIEvents::EventNames::keyup, key, modifiers, code_point);
+    // FIXME: Figure out the right event target.
+    return m_frame.active_document()->window().dispatch_event(move(event));
+}
+
 void EventHandler::set_mouse_event_tracking_layout_node(Layout::Node* layout_node)
 {
     if (layout_node)

Userland/Libraries/LibWeb/Page/EventHandler.h

@@ -30,6 +30,7 @@ public:
     bool handle_mousewheel(const Gfx::IntPoint&, unsigned buttons, unsigned modifiers, int wheel_delta);
 
     bool handle_keydown(KeyCode, unsigned modifiers, u32 code_point);
+    bool handle_keyup(KeyCode, unsigned modifiers, u32 code_point);
 
     void set_mouse_event_tracking_layout_node(Layout::Node*);
 

Userland/Libraries/LibWeb/Page/Page.cpp

@@ -81,4 +81,9 @@ bool Page::handle_keydown(KeyCode key, unsigned modifiers, u32 code_point)
     return focused_context().event_handler().handle_keydown(key, modifiers, code_point);
 }
 
+bool Page::handle_keyup(KeyCode key, unsigned modifiers, u32 code_point)
+{
+    return focused_context().event_handler().handle_keyup(key, modifiers, code_point);
+}
+
 }

Userland/Libraries/LibWeb/Page/Page.h

@@ -52,6 +52,7 @@ public:
     bool handle_mousewheel(const Gfx::IntPoint&, unsigned button, unsigned modifiers, int wheel_delta);
 
     bool handle_keydown(KeyCode, unsigned modifiers, u32 code_point);
+    bool handle_keyup(KeyCode, unsigned modifiers, u32 code_point);
 
     Gfx::Palette palette() const;
     Gfx::IntRect screen_rect() const;