[ios clean] Creates ToolbarWebState Mediator

ios/clean/chrome/browser/ui/tab/tab_coordinator.mm

 // 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.       =
 // ============================================================================
 
 #import "ios/clean/chrome/browser/ui/tab/tab_coordinator.h"
 
 #include <memory>
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #import "ios/clean/chrome/browser/browser_coordinator+internal.h"
 #import "ios/clean/chrome/browser/ui/animators/zoom_transition_animator.h"
 #import "ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h"
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_coordinator.h"
 #import "ios/clean/chrome/browser/ui/web_contents/web_coordinator.h"
 #import "ios/shared/chrome/browser/coordinator_context/coordinator_context.h"
-#import "ios/web/public/web_state/web_state_observer_bridge.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 // Placeholder "experiment" flag. Change this to YES to have the toolbar at the
 // bottom.
 const BOOL kUseBottomToolbar = NO;
 }  // namespace
 
 @interface TabCoordinator ()<UIViewControllerTransitioningDelegate>
 @property(nonatomic, strong) TabContainerViewController* viewController;
 @end
 
-@implementation TabCoordinator {
-  std::unique_ptr<web::WebStateObserverBridge> _webStateObserver;
-}
-
+@implementation TabCoordinator
 @synthesize presentationKey = _presentationKey;
 @synthesize viewController = _viewController;
 @synthesize webState = _webState;
 
 - (void)start {
   self.viewController = [self newTabContainer];
   self.viewController.transitioningDelegate = self;
   self.viewController.modalPresentationStyle = UIModalPresentationCustom;
 
   WebCoordinator* webCoordinator = [[WebCoordinator alloc] init];
   webCoordinator.webState = self.webState;
   [self addChildCoordinator:webCoordinator];
   // Unset the base view controller, so |webCoordinator| doesn't present its
   // view controller.
   webCoordinator.context.baseViewController = nil;
   [webCoordinator start];
 
   ToolbarCoordinator* toolbarCoordinator = [[ToolbarCoordinator alloc] init];
+  toolbarCoordinator.webState = self.webState;
   [self addChildCoordinator:toolbarCoordinator];
-  // PLACEHOLDER : Pass the WebState into the toolbar coordinator and let it
-  // create a mediator (or whatever) that observes the webState.
-  _webStateObserver = base::MakeUnique<web::WebStateObserverBridge>(
-      self.webState, toolbarCoordinator);
+
   // Unset the base view controller, so |toolbarCoordinator| doesn't present
   // its view controller.
   toolbarCoordinator.context.baseViewController = nil;
   [toolbarCoordinator start];
 
   self.viewController.toolbarViewController = toolbarCoordinator.viewController;
   self.viewController.contentViewController = webCoordinator.viewController;
 
   [self.context.baseViewController presentViewController:self.viewController
                                                 animated:self.context.animated
                                               completion:nil];
 }
 
 - (void)stop {
   [self.viewController.presentingViewController
       dismissViewControllerAnimated:self.context.animated
                          completion:nil];
-  _webStateObserver.reset();
 }
 
 - (BOOL)canAddOverlayCoordinator:(BrowserCoordinator*)overlayCoordinator {
   // This coordinator will always accept overlay coordinators.
   return YES;
 }
 
 #pragma mark - Experiment support
 
 // Create and return a new view controller for use as a tab container;
@@ skipping 22 matching lines @@
 - (id<UIViewControllerAnimatedTransitioning>)
 animationControllerForDismissedController:(UIViewController*)dismissed {
   ZoomTransitionAnimator* animator = [[ZoomTransitionAnimator alloc] init];
   animator.presenting = NO;
   animator.presentationKey = self.presentationKey;
   [animator selectDelegate:@[ dismissed.presentingViewController ]];
   return animator;
 }
 
 @end