Upstream Chrome on iOS source code [10/11].

ios/chrome/browser/ui/web_contents/web_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/chrome/browser/ui/web_contents/web_coordinator.h"
+
+#import "ios/chrome/browser/browser_coordinator+internal.h"
+#import "ios/chrome/browser/ui/web_contents/web_contents_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface WebCoordinator ()
+
+@property(nonatomic, strong) WebContentsViewController* viewController;
+@property(nonatomic, readwrite, strong) WebMediator* webMediator;
+
+@end
+
+@implementation WebCoordinator
+@synthesize webMediator = _webMediator;
+@synthesize viewController = _viewController;
+
+- (void)start {
+  self.viewController = [[WebContentsViewController alloc]
+      initWithWebState:self.webMediator.webState];
+
+  // Reminder: this is a no-op if |rootViewController| is nil, for example
+  // when this coordinator's view controller will be contained instead of
+  // presented.
+  [self.rootViewController presentViewController:self.viewController
+                                        animated:YES
+                                      completion:nil];
+}
+
+- (void)setWebState:(web::WebState*)webState {
+  self.webMediator = [[WebMediator alloc] initWithWebState:webState];
+}
+
+@end