init header components

src/app/browser/header/tray.rs

@@ -0,0 +1,30 @@
+#[path = "tray/menu.rs"] mod menu;
+#[path = "tray/tab.rs"] mod tab;
+
+use gtk::Box;
+use gtk::prelude::BoxExt;
+
+pub fn new() -> Box
+{
+    let tray = Box::builder()
+
+        // Tuneup
+        .orientation(
+            gtk::Orientation::Horizontal
+        )
+
+        .spacing(8)
+
+        .build();
+
+    // Compose childs
+    tray.append(
+        &menu::new()
+    );
+
+    tray.append(
+        &tab::new()
+    );
+
+    return tray;
+}