Upstream Chrome on iOS source code [8/11].

ios/chrome/browser/ui/tab/tab_container_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_TAB_CONTAINER_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_TAB_TAB_CONTAINER_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/presenters/menu_presentation_delegate.h"
+
+// Base class for a view controller that contains a content view (generally
+// some kind of web view, but nothing in this class assumes that) and a toolbar
+// view, each managed by their own view controllers.
+// Subclasses manage the specific layout of these view controllers.
+@interface TabContainerViewController
+    : UIViewController<MenuPresentationDelegate>
+
+// View controller showing the main content for the tab. If there is no
+// toolbar view controller set, the contents of this view controller will
+// fill all of the tab container's view.
+@property(nonatomic, strong) UIViewController* contentViewController;
+
+// View controller showing the toolbar for the tab. It will be of a fixed
+// height (determined internally by the tab container), but will span the
+// width of the tab.
+@property(nonatomic, strong) UIViewController* toolbarViewController;
+
+@end
+
+// Tab container which positions the toolbar at the top.
+@interface TopToolbarTabViewController : TabContainerViewController
+@end
+
+// Tab container which positions the toolbar at the bottom.
+@interface BottomToolbarTabViewController : TabContainerViewController
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_TAB_TAB_CONTAINER_VIEW_CONTROLLER_H_