Makes -init and -setType: available in CollectionViewItem

ios/chrome/browser/ui/collection_view/cells/collection_view_item_unittest.mm

 // 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.
 
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item+collection_view_controller.h"
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 TEST(CollectionViewItemTest, Accessors) {
   CollectionViewItem* five = [[CollectionViewItem alloc] initWithType:5];
   CollectionViewItem* twelve = [[CollectionViewItem alloc] initWithType:12];
 
   EXPECT_EQ(5, [five type]);
   EXPECT_EQ(12, [twelve type]);
+
+  // Test setting the type property used in CollectionViewController.
+  [five setType:55];
+  EXPECT_EQ(55, [five type]);
+
+  [twelve setType:1212];
+  EXPECT_EQ(1212, [twelve type]);
 }
 
 TEST(CollectionViewItemTest, ConfigureCellPortsAccessibilityProperties) {
   CollectionViewItem* item = [[CollectionViewItem alloc] initWithType:0];
   item.accessibilityIdentifier = @"test_identifier";
   item.accessibilityTraits = UIAccessibilityTraitButton;
   MDCCollectionViewCell* cell = [[[item cellClass] alloc] init];
   EXPECT_TRUE([cell isMemberOfClass:[MDCCollectionViewCell class]]);
   EXPECT_EQ(UIAccessibilityTraitNone, [cell accessibilityTraits]);
   EXPECT_FALSE([cell accessibilityIdentifier]);
   [item configureCell:cell];
   EXPECT_EQ(UIAccessibilityTraitButton, [cell accessibilityTraits]);
   EXPECT_EQ(@"test_identifier", [cell accessibilityIdentifier]);
 }
 
 }  // namespace