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

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

+// Copyright 2014 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_TAB_HISTORY_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_HISTORY_TAB_HISTORY_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+// View controller for displaying a list of CRWSessionEntry objects in a table.
+@interface TabHistoryViewController : UICollectionViewController
+
+// TODO(crbug.com/546355): Convert this class to use an array of
+//    NavigationEntries.
+@property(nonatomic, retain) NSArray* sessionEntries;
+
+// Returns the optimal height needed to display the session entries.
+// The height returned is usually less than the |suggestedHeight| unless
+// the last row of the table puts the height just over the |suggestedHeight|.
+// If the session entries table is taller than the |suggestedHeight| by at least
+// one row, the last visible session entry will be shown partially so the user
+// can tell that the table is scrollable.
+- (CGFloat)optimalHeight:(CGFloat)suggestedHeight;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_HISTORY_TAB_HISTORY_VIEW_CONTROLLER_H_