[ios clean] Refactors ToolsMenu and Tabs presentation

ios/clean/chrome/browser/ui/animators/zoom_transition_controller.mm

+// Copyright 2017 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.
+
+#import "ios/clean/chrome/browser/ui/animators/zoom_transition_controller.h"
+
+#import "ios/clean/chrome/browser/ui/animators/zoom_transition_animator.h"
+
+@implementation ZoomTransitionController
+@synthesize presentationKey = _presentationKey;
+
+#pragma mark - UIViewControllerTransitioningDelegate
+
+- (id<UIViewControllerAnimatedTransitioning>)
+animationControllerForPresentedController:(UIViewController*)presented
+                     presentingController:(UIViewController*)presenting
+                         sourceController:(UIViewController*)source {
+  ZoomTransitionAnimator* animator = [[ZoomTransitionAnimator alloc] init];
+  animator.presenting = YES;
+  animator.presentationKey = self.presentationKey;
+  [animator selectDelegate:@[ source, presenting ]];
+  return animator;
+}
+
+- (id<UIViewControllerAnimatedTransitioning>)
+animationControllerForDismissedController:(UIViewController*)dismissed {
+  ZoomTransitionAnimator* animator = [[ZoomTransitionAnimator alloc] init];
+  animator.presenting = NO;
+  animator.presentationKey = self.presentationKey;
+  [animator selectDelegate:@[ dismissed.presentingViewController ]];
+  return animator;
+}
+
+@end