[ios] Adds support for Find in Page to the new architecture.

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/actions/tab_grid_actions.h"
 #import "ios/clean/chrome/browser/ui/actions/tab_strip_actions.h"
 #import "ios/clean/chrome/browser/ui/animators/zoom_transition_animator.h"
+#import "ios/clean/chrome/browser/ui/find_in_page/find_in_page_coordinator.h"
 #import "ios/clean/chrome/browser/ui/ntp/new_tab_page_coordinator.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.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."
@@ skipping 35 matching lines @@
 
   ToolbarCoordinator* toolbarCoordinator = [[ToolbarCoordinator alloc] init];
   toolbarCoordinator.webState = self.webState;
   [self addChildCoordinator:toolbarCoordinator];
 
   // Unset the base view controller, so |toolbarCoordinator| doesn't present
   // its view controller.
   toolbarCoordinator.context.baseViewController = nil;
   [toolbarCoordinator start];
 
+  // Create the FindInPage coordinator but do not start it.  It will be started
+  // when a find in page operation is invoked.
+  FindInPageCoordinator* findInPageCoordinator =
+      [[FindInPageCoordinator alloc] init];
+  [self addChildCoordinator:findInPageCoordinator];
+
   // PLACEHOLDER: Replace this placeholder with an actual tab strip view
   // controller.
   UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
   [button addTarget:nil
                 action:@selector(hideTabStrip:)
       forControlEvents:UIControlEventTouchUpInside];
   [button setTitle:@"Hide Strip" forState:UIControlStateNormal];
   button.frame = CGRectMake(10, 10, 100, 100);
 
   UIViewController* tabStripViewController = [[UIViewController alloc] init];
   tabStripViewController.view.backgroundColor = [UIColor blackColor];
   [tabStripViewController.view addSubview:button];
   self.viewController.tabStripViewController = tabStripViewController;
 
   [self.context.baseViewController presentViewController:self.viewController
                                                 animated:self.context.animated
                                               completion:nil];
   [super start];
 }
 
 - (void)stop {
   [super stop];
   [self.viewController.presentingViewController
       dismissViewControllerAnimated:self.context.animated
                          completion:nil];
   _webStateObserver.reset();
 }
 
 - (void)childCoordinatorDidStart:(BrowserCoordinator*)coordinator {
-  if ([coordinator isKindOfClass:[ToolbarCoordinator class]]) {
+  if ([coordinator isKindOfClass:[FindInPageCoordinator class]]) {
+    self.viewController.findBarViewController = coordinator.viewController;
+  } else if ([coordinator isKindOfClass:[ToolbarCoordinator class]]) {
     self.viewController.toolbarViewController = coordinator.viewController;
   } else if ([coordinator isKindOfClass:[WebCoordinator class]]) {
     self.viewController.contentViewController = coordinator.viewController;
   }
 }
 
+- (void)childCoordinatorWillStop:(BrowserCoordinator*)coordinator {
+  if ([coordinator isKindOfClass:[FindInPageCoordinator class]]) {
+    self.viewController.findBarViewController = nil;

[rohitrao (ping after 24h), 2017/03/14 01:10:37]

12) The FIP coordinator can be stopped and its UI destroyed, unlike the others.

+  } else {
+    // No other child coordinators should ever stop.
+    NOTREACHED();
+  }
+}
+
 - (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;
 // experimental configurations determine which subclass of
 // TabContainerViewController to return.
@@ skipping 35 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