Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/tab_grid/tab_grid_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.
+
+// ======                        New Architecture                         =====
+// =         This code is only used in the new iOS Chrome architecture.       =
+// ============================================================================
+
+#ifndef IOS_CHROME_BROWSER_UI_TAB_GRID_TAB_GRID_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_TAB_GRID_TAB_GRID_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/animators/zoom_transition_delegate.h"
+
+// The data source for tab grid UI.
+// Conceptually the tab grid represents a group of WebState objects (which
+// are ultimately the model-layer representation of a browser tab). The data
+// source must be able to map between indices and WebStates.
+@protocol TabGridDataSource<NSObject>
+
+// The number of tabs to be displayed in the grid.
+- (NSUInteger)numberOfTabsInTabGrid;
+
+// Title for the tab at |index| in the grid.
+- (NSString*)titleAtIndex:(NSInteger)index;
+
+@end
+
+@protocol TabGridActionDelegate<NSObject>
+- (void)showTabAtIndexPath:(NSIndexPath*)indexPath;
+- (void)showTabGrid;
+- (void)showSettings;
+@end
+
+// Controller for a scrolling view displaying square cells that represent
+// the user's open tabs.
+@interface TabGridViewController : UIViewController<ZoomTransitionDelegate>
+
+// Data source for the tabs to be displayed.
+@property(nonatomic, weak) id<TabGridDataSource> dataSource;
+@property(nonatomic, weak) id<TabGridActionDelegate> actionDelegate;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_TAB_GRID_TAB_GRID_VIEW_CONTROLLER_H_