mandoline: Add find in page.

mandoline/ui/desktop_ui/find_bar_delegate.h

+// 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_FIND_BAR_DELEGATE_H_
+#define MANDOLINE_UI_DESKTOP_UI_FIND_BAR_DELEGATE_H_
+
+#include <string>
+
+namespace mandoline {
+
+class FindBarDelegate {
+ public:
+  virtual ~FindBarDelegate() {}
+
+  virtual void OnDoFind(const std::string& find) = 0;
+
+  virtual void OnHideFindBar() = 0;
+};
+
+}  // namespace mandoline
+
+#endif  // MANDOLINE_UI_DESKTOP_UI_FIND_BAR_DELEGATE_H_