Makes -init and -setType: available in CollectionViewItem

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

Index: ios/chrome/browser/ui/collection_view/cells/collection_view_item_unittest.mm
diff --git a/ios/chrome/browser/ui/collection_view/cells/collection_view_item_unittest.mm b/ios/chrome/browser/ui/collection_view/cells/collection_view_item_unittest.mm
index 7e2a32d8455d9b6013082b8f28d5b204bfe5915b..5642c3b47c6d64839657ad720d58125b55f184d4 100644
--- a/ios/chrome/browser/ui/collection_view/cells/collection_view_item_unittest.mm
+++ b/ios/chrome/browser/ui/collection_view/cells/collection_view_item_unittest.mm
@@ -4,6 +4,7 @@
 
 #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"
 
@@ -19,6 +20,13 @@ TEST(CollectionViewItemTest, Accessors) {
 
   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) {