mandoline: Add back/forward support and UI.

mandoline/ui/desktop_ui/toolbar_view.h

Index: mandoline/ui/desktop_ui/toolbar_view.h
diff --git a/mandoline/ui/desktop_ui/toolbar_view.h b/mandoline/ui/desktop_ui/toolbar_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..d67ae7321062c1e83ecfa156b64451af9d0bdab8
--- /dev/null
+++ b/mandoline/ui/desktop_ui/toolbar_view.h
@@ -0,0 +1,45 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MANDOLINE_UI_DESKTOP_UI_TOOLBAR_VIEW_H_
+#define MANDOLINE_UI_DESKTOP_UI_TOOLBAR_VIEW_H_
+
+#include "ui/views/view.h"
+#include "ui/views/controls/button/label_button.h"
+
+namespace views {
+class BoxLayout;
+class LabelButton;
+}
+
+namespace mandoline {
+class BrowserWindow;
+
+class ToolbarView : public views::View,
+                    public views::ButtonListener {
+ public:
+  ToolbarView(BrowserWindow* browser_window);
+  ~ToolbarView() override;
+
+  // Sets the state of the visual elements.
+  void SetOmniboxText(const base::string16& text);
+  void SetBackForwardEnabled(bool back_enabled, bool forward_enabled);
+
+  // Overridden from views::ButtonListener:
+  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
+
+ private:
+  BrowserWindow* browser_window_;
+
+  views::BoxLayout* layout_;
+  views::LabelButton* back_button_;
+  views::LabelButton* forward_button_;
+  views::LabelButton* omnibox_launcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(ToolbarView);
+};
+
+}  // namespace mandoline
+
+#endif  // MANDOLINE_UI_DESKTOP_UI_TOOLBAR_VIEW_H_