LibWeb: Allow inserting text at the cursor by typing characters :^)

This works everywhere right now, but it's obviously not going to stay
that way forever. :^)

Note that this does not advance the cursor correctly for whitespace
since the cursor is DOM-based and doesn't take whitespace collapsing
into account yet.

Libraries/LibWeb/Page/Page.cpp

@@ -65,4 +65,9 @@ bool Page::handle_mousemove(const Gfx::IntPoint& position, unsigned buttons, uns
     return main_frame().event_handler().handle_mousemove(position, buttons, modifiers);
 }
 
+bool Page::handle_keydown(KeyCode key, unsigned modifiers, u32 code_point)
+{
+    return main_frame().event_handler().handle_keydown(key, modifiers, code_point);
+}
+
 }