[Clean Skeleton] Migrate code to clean/

ios/chrome/browser/browser_coordinator+internal.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_BROWSER_COORDINATOR_INTERNAL_H_
-#define IOS_CHROME_BROWSER_BROWSER_COORDINATOR_INTERNAL_H_
-
-#import "ios/chrome/browser/browser_coordinator.h"
-
-// Internal API for subclasses and categories of BrowserCoordinator.
-//
-// This API can be used to create and manage 'overlay coordinators'.
-// Overlay coordinators are intended to be used for UI elements that
-// sit on top of the regular UI, and which may need to be dismissed
-// by coordinators that don't have direct access to them. Typical uses
-// would be alerts, login prompts, or other UI that might be dismissed
-// if (for example) an external event causes a web page to load.
-// Overlay coordinators can be added by any coordinator in the coordinator
-// hierarchy, but they will be children of (generally) the topmost
-// coordinator, regardless of which coordinator added them.
-@interface BrowserCoordinator (Internal)
-
-// Managed view controller of this object. Subclasses must define a
-// property named |viewController| that has the specific UIViewController
-// subclass they use; the subclass API will be able to access that view
-// controller through this property.
-@property(nonatomic, readonly) UIViewController* viewController;
-
-// The child coordinators of this coordinator. To add or remove from this set,
-// use the -addChildCoordinator: and -removeChildCoordinator: methods.
-@property(nonatomic, readonly) NSSet<BrowserCoordinator*>* children;
-
-// The coordinator that added this coordinator as a child, if any.
-@property(nonatomic, readonly) BrowserCoordinator* parentCoordinator;
-
-// YES if the receiver is acting as an overlay coordinator; NO (the default)
-// otherwise.
-@property(nonatomic, readonly) BOOL overlaying;
-
-// The coordinator (if any) in the coordinator hierarchy (starting with
-// the receiver) that is overlaying. If the receiver isn't overlaying,
-// it recursively asks its children.
-@property(nonatomic, readonly) BrowserCoordinator* overlayCoordinator;
-
-// Adds |coordinator| as a child, taking ownership of it, setting the receiver's
-// viewController (if any) as the child's rootViewController, and setting
-// the receiver's browserState as the child's browserState.
-- (void)addChildCoordinator:(BrowserCoordinator*)coordinator;
-
-// Removes |coordinator| as a child, relinquishing ownership of it. If
-// |coordinator| isn't a child of the receiver, this method does nothing.
-- (void)removeChildCoordinator:(BrowserCoordinator*)coordinator;
-
-// Methods for adding overlay coordinators.
-
-// Returns YES if the receiver will take |overlayCoordinator| as a child.
-// The default is to return YES only if the receiver has no children.
-- (BOOL)canAddOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator;
-
-// Adds |overlayCoordinator| as a child to the receiver, or if it cannot be
-// added, recursively add it to the receiver's child. If a receiver has
-// multiple children and returns YES from -canAddOverlayCoordinator:, it
-// must override this method to determines how the overlay is added.
-- (void)addOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator;
-
-// Removes the current overlay coordinator (if any) as a child from its
-// parent.
-- (void)removeOverlayCoordinator;
-
-@end
-
-#endif  // IOS_CHROME_BROWSER_BROWSER_COORDINATOR_INTERNAL_H_