Added web::GetCommittedItemWithUniqueID function.

ios/web/navigation/navigation_manager_util_unittest.mm

+// Copyright 2017 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.
+
+#include "ios/web/navigation/navigation_manager_util.h"
+
+#include "base/memory/ptr_util.h"
+#import "ios/web/navigation/crw_session_controller+private_constructors.h"
+#import "ios/web/navigation/crw_session_controller.h"
+#import "ios/web/navigation/navigation_manager_impl.h"
+#import "ios/web/public/navigation_item.h"
+#include "ios/web/public/test/fakes/test_browser_state.h"
+#include "testing/platform_test.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace web {
+
+// Test fixture testing navigation_manager_util.h functions.
+class NavigationManagerUtilTest : public PlatformTest {
+ protected:
+  NavigationManagerUtilTest()
+      : controller_([[CRWSessionController alloc]
+            initWithBrowserState:&browser_state_]) {
+    manager_.SetSessionController(controller_);
+  }
+
+  NavigationManagerImpl manager_;
+  CRWSessionController* controller_;
+
+ private:
+  TestBrowserState browser_state_;
+};
+
+// Tests GetCommittedItemWithUniqueID and GetCommittedItemIndexWithUniqueID
+// functions.
+TEST_F(NavigationManagerUtilTest, GetCommittedItemWithUniqueID) {
+  // Start with NavigationManager that only has a pending item.
+  manager_.AddPendingItem(
+      GURL("http://chromium.org"), Referrer(), ui::PAGE_TRANSITION_TYPED,
+      web::NavigationInitiationType::USER_INITIATED,
+      web::NavigationManager::UserAgentOverrideOption::INHERIT);
+  NavigationItem* item = manager_.GetPendingItem();
+  int unique_id = item->GetUniqueID();
+  EXPECT_FALSE(GetCommittedItemWithUniqueID(&manager_, unique_id));
+  EXPECT_EQ(-1, GetCommittedItemIndexWithUniqueID(&manager_, unique_id));
+
+  // Commit that pending item.
+  [controller_ commitPendingItem];
+  EXPECT_EQ(item, GetCommittedItemWithUniqueID(&manager_, unique_id));
+  EXPECT_EQ(0, GetCommittedItemIndexWithUniqueID(&manager_, unique_id));
+
+  // Remove committed item.
+  manager_.RemoveItemAtIndex(0);
+  EXPECT_FALSE(GetCommittedItemWithUniqueID(&manager_, unique_id));
+  EXPECT_EQ(-1, GetCommittedItemIndexWithUniqueID(&manager_, unique_id));
+}
+
+}  // namespace web