Add a way to reconfigure cell from IndexPaths

ios/chrome/browser/ui/collection_view/collection_view_controller.h

Index: ios/chrome/browser/ui/collection_view/collection_view_controller.h
diff --git a/ios/chrome/browser/ui/collection_view/collection_view_controller.h b/ios/chrome/browser/ui/collection_view/collection_view_controller.h
index 3162a35b0b55d157086c2567d4642446f8b7f84a..4273f56b6f1f9c02a548ae2148459aa4178acc1e 100644
--- a/ios/chrome/browser/ui/collection_view/collection_view_controller.h
+++ b/ios/chrome/browser/ui/collection_view/collection_view_controller.h
@@ -47,6 +47,10 @@ typedef NS_ENUM(NSInteger, CollectionViewControllerStyle) {
 - (void)reconfigureCellsForItems:(NSArray*)items
          inSectionWithIdentifier:(NSInteger)sectionIdentifier;
 
+// Reconfigures the cells corresponding to the given |indexPaths| by calling
+// |configureCell:| on each cell.
+- (void)reconfigureCellsAtIndexPaths:(NSArray*)indexPaths;
+
 #pragma mark MDCCollectionViewEditingDelegate
 
 // Updates the model with changes to the collection view items. Must be called