Upstream Chrome on iOS source code [5/11].

ios/chrome/browser/ui/history/history_search_view_controller.h

+// 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 IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_SEARCH_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_SEARCH_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+@class HistorySearchViewController;
+
+// Delegate for HistorySearchViewController. Used to pass on search bar
+// interactions.
+@protocol HistorySearchViewControllerDelegate<NSObject>
+// Called when the search button is clicked.
+- (void)historySearchViewController:
+            (HistorySearchViewController*)historySearchViewController
+            didRequestSearchForTerm:(NSString*)searchTerm;
+// Called when the search view's cancel button is clicked.
+- (void)historySearchViewControllerDidCancel:
+    (HistorySearchViewController*)historySearchViewController;
+@end
+
+// Controller for the search bar used in the history panel.
+@interface HistorySearchViewController : UIViewController
+
+// Delegate for forwarding interactions with the search view.
+@property(nonatomic, weak) id<HistorySearchViewControllerDelegate> delegate;
+// YES if the search view is enabled. Setting this property enables or disables
+// the search view, as appropriate.
+@property(nonatomic, getter=isEnabled) BOOL enabled;
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_SEARCH_VIEW_CONTROLLER_H_