Added NavigationManager::GetIndexOfItem().

ios/web/navigation/navigation_manager_impl_unittest.mm

 // Copyright 2014 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/web/navigation/navigation_manager_impl.h"
 
 #include "base/logging.h"
 #include "base/mac/bind_objc_block.h"
 #import "base/mac/scoped_nsobject.h"
 #import "ios/web/navigation/crw_session_controller+private_constructors.h"
@@ skipping 1345 matching lines @@
   GURL url4(url::SchemeHostPort(kSchemeToRewrite, "test4", 0).Serialize());
   navigation_manager()->AddPendingItem(
       url4, Referrer(), ui::PAGE_TRANSITION_LINK,
       web::NavigationInitiationType::RENDERER_INITIATED,
       web::NavigationManager::UserAgentOverrideOption::INHERIT);
   GURL rewritten_url4(
       url::SchemeHostPort(kTestWebUIScheme, "test4", 0).Serialize());
   EXPECT_EQ(rewritten_url4, navigation_manager()->GetPendingItem()->GetURL());
 }
 
+// Tests that GetIndexOfItem() returns the correct values.
+TEST_F(NavigationManagerTest, GetIndexOfItem) {
+  // Create two items and add them to the NavigationManagerImpl.
+  navigation_manager()->AddPendingItem(
+      GURL("http://www.url.com/0"), Referrer(), ui::PAGE_TRANSITION_TYPED,
+      web::NavigationInitiationType::USER_INITIATED,
+      web::NavigationManager::UserAgentOverrideOption::INHERIT);
+  navigation_manager()->CommitPendingItem();
+  web::NavigationItem* item0 = navigation_manager()->GetLastCommittedItem();
+  navigation_manager()->AddPendingItem(
+      GURL("http://www.url.com/1"), Referrer(), ui::PAGE_TRANSITION_TYPED,
+      web::NavigationInitiationType::USER_INITIATED,
+      web::NavigationManager::UserAgentOverrideOption::INHERIT);
+  navigation_manager()->CommitPendingItem();
+  web::NavigationItem* item1 = navigation_manager()->GetLastCommittedItem();
+  // Create an item that does not exist in the NavigationManagerImpl.
+  std::unique_ptr<web::NavigationItem> item_not_found =
+      web::NavigationItem::Create();
+  // Verify GetIndexOfItem() results.
+  EXPECT_EQ(0, navigation_manager()->GetIndexOfItem(item0));
+  EXPECT_EQ(1, navigation_manager()->GetIndexOfItem(item1));
+  EXPECT_EQ(-1, navigation_manager()->GetIndexOfItem(item_not_found.get()));
+}
+
 }  // namespace web