Implement the Windows desktop search redirection feature.

components/search_engines/desktop_search_redirection_infobar_delegate.h

Index: components/search_engines/desktop_search_redirection_infobar_delegate.h
diff --git a/components/search_engines/desktop_search_redirection_infobar_delegate.h b/components/search_engines/desktop_search_redirection_infobar_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..bccb77a76084f848d34e486bd3b118a39e628b06
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+++ b/components/search_engines/desktop_search_redirection_infobar_delegate.h
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+// Copyright 2016 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 COMPONENTS_SEARCH_ENGINES_DESKTOP_SEARCH_INFOBAR_DELEGATE_H_
+#define COMPONENTS_SEARCH_ENGINES_DESKTOP_SEARCH_INFOBAR_DELEGATE_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "components/infobars/core/confirm_infobar_delegate.h"
+
+class PrefService;
+
+namespace infobars {
+class InfoBarManager;
+}  // namespace infobars
+
+// Informs the user that a desktop search has been redirected to the default
+// search engine.
+class DesktopSearchRedirectionInfobarDelegate : public ConfirmInfoBarDelegate {
+ public:
+  // Creates a search redirection infobar and delegate and adds the infobar to
+  // |infobar_manager|.  Records in |pref_service| that such an infobar was
+  // shown. |default_search_engine_name| is the name of the default search
+  // engine. |manage_search_settings_callback| should open the search settings
+  // page.
+  static void Show(infobars::InfoBarManager* infobar_manager,
+                   const base::string16& default_search_engine_name,
+                   const base::Closure& manage_search_settings_callback,
+                   PrefService* pref_service);
+
+ private:
+  DesktopSearchRedirectionInfobarDelegate(
+      const base::string16& default_search_engine_name,
+      const base::Closure& manage_search_settings_callback);
+  ~DesktopSearchRedirectionInfobarDelegate() override;
+
+  // ConfirmInfoBarDelegate:
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
+  void InfoBarDismissed() override;
+  base::string16 GetMessageText() const override;
+  int GetButtons() const override;
+  base::string16 GetButtonLabel(InfoBarButton button) const override;
+  bool Accept() override;
+
+  base::string16 default_search_engine_name_;
+  base::Closure manage_search_settings_callback_;
+
+  // True when the infobar has been closed explicitly by the user.
+  bool closed_by_user_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopSearchRedirectionInfobarDelegate);
+};
+
+#endif  // COMPONENTS_SEARCH_ENGINES_DESKTOP_SEARCH_INFOBAR_DELEGATE_H_