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diff --git a/mandoline/ui/browser/browser_delegate.h b/mandoline/ui/browser/browser_delegate.h
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+++ b/mandoline/ui/browser/browser_delegate.h
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+// 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_DELEGATE_H_
+#define MANDOLINE_UI_BROWSER_BROWSER_DELEGATE_H_
+
+namespace mojo {
+class View;
+}
+
+namespace mandoline {
+
+class Browser;
+
+// A BrowserDelegate is an interface to be implemented by an object that manages
+// the lifetime of a Browser.
+class BrowserDelegate {
+ public:
+  // Invoken when the Browser wishes to close. This gives the delegate the
+  // opportunity to perform some cleanup.
+  virtual void BrowserClosed(Browser* browser) = 0;
+
+  // Requests initialization of state to display the browser on screen. Returns
+  // whether UI was initialized at this point.
+  virtual bool InitUIIfNecessary(Browser* browser, mojo::View* root_view) = 0;
+
+ protected:
+  virtual ~BrowserDelegate() {}
+};
+
+}  // mandoline
+
+#endif  // MANDOLINE_UI_BROWSER_BROWSER_DELEGATE_H_