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

ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h

Index: ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h
diff --git a/ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h b/ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h
index 372d108e6d163b9704ff0ec2dc5dc928cc175b44..b2039ea80b9532f566094a1b63e6f71d6ae6a61b 100644
--- a/ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h
+++ b/ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h
@@ -31,6 +31,11 @@
 // width of the tab.
 @property(nonatomic, strong) UIViewController* tabStripViewController;
 
+// View controller showing the find bar.  The location of this controller's view
+// is determined by size class and device type.  May be nil if the find bar is
+// currently closed.
+@property(nonatomic, strong) UIViewController* findBarViewController;
+
 @end
 
 // Tab container which positions the toolbar at the top.