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

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

Index: ios/clean/chrome/browser/ui/tab/tab_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/tab/tab_coordinator.mm b/ios/clean/chrome/browser/ui/tab/tab_coordinator.mm
index a821971055d3c240c7a8278f306aa8d35e2187f4..ad4db4847ec8e1c891564e63dae85f344b8b7777 100644
--- a/ios/clean/chrome/browser/ui/tab/tab_coordinator.mm
+++ b/ios/clean/chrome/browser/ui/tab/tab_coordinator.mm
@@ -16,6 +16,7 @@
 #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"
@@ -71,6 +72,12 @@ const BOOL kUseBottomToolbar = NO;
   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];
@@ -100,13 +107,24 @@ const BOOL kUseBottomToolbar = NO;
 }
 
 - (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;