[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.
 
 #import "ios/clean/chrome/browser/ui/tab/tab_coordinator.h"
 
 #include <memory>
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #import "ios/clean/chrome/browser/ui/animators/zoom_transition_animator.h"
 #import "ios/clean/chrome/browser/ui/commands/tab_commands.h"
+#import "ios/clean/chrome/browser/ui/find_in_page/find_in_page_coordinator.h"
 #import "ios/clean/chrome/browser/ui/ntp/ntp_coordinator.h"
 #import "ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h"
 #import "ios/clean/chrome/browser/ui/tab_strip/tab_strip_coordinator.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/ui/browser_list/browser.h"
 #import "ios/shared/chrome/browser/ui/commands/command_dispatcher.h"
 #import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
@@ skipping 43 matching lines @@
   webCoordinator.webState = self.webState;
   [self addChildCoordinator:webCoordinator];
   [webCoordinator start];
   self.webCoordinator = webCoordinator;
 
   ToolbarCoordinator* toolbarCoordinator = [[ToolbarCoordinator alloc] init];
   toolbarCoordinator.webState = self.webState;
   [self addChildCoordinator:toolbarCoordinator];
   [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];
+
   TabStripCoordinator* tabStripCoordinator = [[TabStripCoordinator alloc] init];
   [self addChildCoordinator:tabStripCoordinator];
   [tabStripCoordinator start];
 
   // PLACEHOLDER: Fix the order of events here. The ntpCoordinator was already
   // created above when |webCoordinator.webState = self.webState;| triggers
   // a load event, but then the webCoordinator stomps on the
   // contentViewController when it starts afterwards.
   if (self.webState->GetLastCommittedURL() == GURL(kChromeUINewTabURL)) {
     self.viewController.contentViewController =
@@ skipping 16 matching lines @@
 
 - (void)childCoordinatorDidStart:(BrowserCoordinator*)childCoordinator {
   if ([childCoordinator isKindOfClass:[ToolbarCoordinator class]]) {
     self.viewController.toolbarViewController = childCoordinator.viewController;
   } else if ([childCoordinator isKindOfClass:[WebCoordinator class]] ||
              [childCoordinator isKindOfClass:[NTPCoordinator class]]) {
     self.viewController.contentViewController = childCoordinator.viewController;
   } else if ([childCoordinator isKindOfClass:[TabStripCoordinator class]]) {
     self.viewController.tabStripViewController =
         childCoordinator.viewController;
+  } else if ([childCoordinator isKindOfClass:[FindInPageCoordinator class]]) {
+    self.viewController.findBarViewController = childCoordinator.viewController;
   }
 }
 
 - (void)childCoordinatorWillStop:(BrowserCoordinator*)childCoordinator {
-  self.viewController.contentViewController = nil;
+  if ([childCoordinator isKindOfClass:[FindInPageCoordinator class]]) {
+    self.viewController.findBarViewController = nil;
+  } else if ([childCoordinator isKindOfClass:[WebCoordinator class]] ||
+             [childCoordinator isKindOfClass:[NTPCoordinator class]]) {
+    self.viewController.contentViewController = nil;
+  }
 }
 
 - (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 52 matching lines @@
   return animator;
 }
 
 #pragma mark - TabCommands
 
 - (void)loadURL:(web::NavigationManager::WebLoadParams)params {
   self.webState->GetNavigationManager()->LoadURLWithParams(params);
 }
 
 @end