Add a simple browser UI (with url bar)

mandoline/ui/browser/browser_ui.h

Index: mandoline/ui/browser/browser_ui.h
diff --git a/mandoline/ui/browser/browser_ui.h b/mandoline/ui/browser/browser_ui.h
new file mode 100644
index 0000000000000000000000000000000000000000..f924de72687b243123b70a041ea9990f35e18e69
--- /dev/null
+++ b/mandoline/ui/browser/browser_ui.h
@@ -0,0 +1,29 @@
+// 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_BROWSER_BROWSER_UI_H_
+#define MANDOLINE_UI_BROWSER_BROWSER_UI_H_
+
+namespace mojo {
+class Shell;
+class View;
+}
+
+namespace mandoline {
+
+class Browser;
+
+class BrowserUI {
+ public:
+  virtual ~BrowserUI() {}
+  static BrowserUI* Create(Browser* browser, mojo::Shell* shell);
+
+  // Called when the Browser UI is embedded within the specified view.
+  virtual void Init(mojo::View* root, mojo::View* content) = 0;
+
+};
+
+}  // namespace mandoline
+
+#endif  // MANDOLINE_UI_BROWSER_BROWSER_UI_H_