[ios] Plumb SnapshotCache into tab grid.

ios/clean/chrome/browser/ui/tab_collection/tab_collection_view_controller.mm

Index: ios/clean/chrome/browser/ui/tab_collection/tab_collection_view_controller.mm
diff --git a/ios/clean/chrome/browser/ui/tab_collection/tab_collection_view_controller.mm b/ios/clean/chrome/browser/ui/tab_collection/tab_collection_view_controller.mm
index 2c1afc47bdc40ff675d0a7f7f62e4a5c5ed26b54..e93ce44860d61abed3d8e6234ed1288e7393ddb1 100644
--- a/ios/clean/chrome/browser/ui/tab_collection/tab_collection_view_controller.mm
+++ b/ios/clean/chrome/browser/ui/tab_collection/tab_collection_view_controller.mm
@@ -30,6 +30,7 @@ const CGSize kTabCollectionTabCellSize = {250.0f, 250.0f};
 @synthesize tabs = _tabs;
 @synthesize items = _items;
 @synthesize selectedIndex = _selectedIndex;
+@synthesize snapshotCache = _snapshotCache;
 
 #pragma mark - UIViewController
 
@@ -120,8 +121,7 @@ const CGSize kTabCollectionTabCellSize = {250.0f, 250.0f};
   [cell setSessionType:TabSwitcherSessionType::REGULAR_SESSION];
   DCHECK_LE(indexPath.item, INT_MAX);
   int index = static_cast<int>(indexPath.item);
-  // PLACEHOLDER: SnapshotCache will be passed into the cell.
-  [cell configureCell:self.items[index] snapshotCache:nil];
+  [cell configureCell:self.items[index] snapshotCache:self.snapshotCache];
   return cell;
 }
 
@@ -197,8 +197,7 @@ const CGSize kTabCollectionTabCellSize = {250.0f, 250.0f};
   TabCollectionTabCell* cell = base::mac::ObjCCastStrict<TabCollectionTabCell>(
       [self.tabs cellForItemAtIndexPath:[NSIndexPath indexPathForItem:index
                                                             inSection:0]]);
-  // PLACEHOLDER: SnapshotCache will be passed into the cell.
-  [cell configureCell:self.items[index] snapshotCache:nil];
+  [cell configureCell:self.items[index] snapshotCache:self.snapshotCache];
 }
 
 - (void)populateItems:(NSArray<TabCollectionItem*>*)items
@@ -214,8 +213,7 @@ const CGSize kTabCollectionTabCellSize = {250.0f, 250.0f};
   TabCollectionTabCell* cell = base::mac::ObjCCastStrict<TabCollectionTabCell>(
       [self.tabs cellForItemAtIndexPath:[NSIndexPath indexPathForItem:index
                                                             inSection:0]]);
-  // PLACEHOLDER: SnapshotCache will be passed into the cell.
-  [cell configureCell:self.items[index] snapshotCache:nil];
+  [cell configureCell:self.items[index] snapshotCache:self.snapshotCache];
 }
 
 @end