[ios clean] Moves animator and presenters under transitions

ios/clean/chrome/browser/ui/animators/zoom_transition_animator.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_CLEAN_CHROME_BROWSER_UI_ANIMATORS_ZOOM_TRANSITION_ANIMATOR_H_
-#define IOS_CLEAN_CHROME_BROWSER_UI_ANIMATORS_ZOOM_TRANSITION_ANIMATOR_H_
-
-#import <UIKit/UIKit.h>
-
-#import "ios/clean/chrome/browser/ui/animators/zoom_transition_delegate.h"
-
-// A transition animator object. The transition (for presentation) will begin
-// with the presented view occupying a rectangle supplied by the delegate, or
-// defaulting to a square in the center of the presenter's view. The
-// presentation animation will change the size of the rectangle to match the
-// final presented size. For dismissal, the same animation is done in reverse.
-@interface ZoomTransitionAnimator
-    : NSObject<UIViewControllerAnimatedTransitioning>
-
-// YES if the receiver is used for a presentation, NO (the default) if used
-// for a dismissal. Calling code should set this before returning this object
-// for UIKit to use.
-@property(nonatomic, assign, getter=isPresenting) BOOL presenting;
-
-// Optional object that can be passed into the delegate to identify a specific
-// location. For example, an object in a table or collection view might have
-// its index path passed in so the delegate can map that to a screen location.
-@property(nonatomic, copy) NSObject* presentationKey;
-
-// Delegate that can supply a source/destination rect for the animation.
-@property(nonatomic, weak) id<ZoomTransitionDelegate> delegate;
-
-// Convenience method to set a delegate from an array of objects that might
-// implement the ZoomTransitionDelegate protocol. For example, either the
-// source or presenting view controller (or neither) might implement the
-// protocol. If |possibleDelegates| is empty, or if no object it contains
-// conforms to ZoomTransitionDelegate, then the receiver's delegate will be
-// nil. If multiple objects in |possibleDelegates| conforms to the protocol,
-// then the first one will become the receiver's delegate.
-- (void)selectDelegate:(NSArray<id<NSObject>>*)possibleDelegates;
-
-@end
-
-#endif  // IOS_CLEAN_CHROME_BROWSER_UI_ANIMATORS_ZOOM_TRANSITION_ANIMATOR_H_