Added NavigationManager::GetIndexOfItem().

ios/web/public/test/fakes/test_navigation_manager.h

 // 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.
 
 #ifndef IOS_WEB_PUBLIC_TEST_FAKES_TEST_NAVIGATION_MANAGER_H_
 #define IOS_WEB_PUBLIC_TEST_FAKES_TEST_NAVIGATION_MANAGER_H_
 
 #import "ios/web/public/navigation_item.h"
 #include "ios/web/public/navigation_item_list.h"
 #import "ios/web/public/navigation_manager.h"
@@ skipping 12 matching lines @@
   NavigationItem* GetVisibleItem() const override;
   NavigationItem* GetLastCommittedItem() const override;
   NavigationItem* GetPendingItem() const override;
   NavigationItem* GetTransientItem() const override;
   void DiscardNonCommittedItems() override;
   void LoadURLWithParams(const NavigationManager::WebLoadParams&) override;
   void AddTransientURLRewriter(
       BrowserURLRewriter::URLRewriter rewriter) override;
   int GetItemCount() const override;
   NavigationItem* GetItemAtIndex(size_t index) const override;
+  int GetIndexOfItem(const NavigationItem* item) const override;
   int GetPendingItemIndex() const override;
   int GetLastCommittedItemIndex() const override;
   bool RemoveItemAtIndex(int index) override;
   bool CanGoBack() const override;
   bool CanGoForward() const override;
   bool CanGoToOffset(int offset) const override;
   void GoBack() override;
   void GoForward() override;
   void GoToIndex(int index) override;
   void Reload(ReloadType reload_type, bool check_for_reposts) override;
@@ skipping 27 matching lines @@
   int items_index_;
   // Individual backing instance variables for Set* test set up methods.
   NavigationItem* pending_item_;
   NavigationItem* last_committed_item_;
   NavigationItem* visible_item_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_TEST_FAKES_TEST_NAVIGATION_MANAGER_H_