[Payment Request] Improved matching for the UIAlertView in showcase egtests

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

Index: ios/chrome/browser/ui/collection_view/collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/collection_view/collection_view_controller.mm b/ios/chrome/browser/ui/collection_view/collection_view_controller.mm
index cbdc9d81cc656e0cdb37f362a3ea3ef7168948b1..65decc131518c50c07d0b7b23a06450f1b6e9845 100644
--- a/ios/chrome/browser/ui/collection_view/collection_view_controller.mm
+++ b/ios/chrome/browser/ui/collection_view/collection_view_controller.mm
@@ -262,6 +262,12 @@
   }
 }
 
+#pragma mark - NSObject
+
+- (NSString*)description {

[Moe, 2017/04/19 22:40:51]

UITableViewController seems to be already overriding this, but not
UICollectionViewController. 

[lpromero, 2017/04/20 16:28:49]

Why do you need this? And why in the context of this CL? (Might be the same
answer for both questions :p)

[Moe, 2017/04/20 17:44:51]

The difference would be:
http://imgur.com/a/SEepa vs http://imgur.com/a/NzXTv
Without overriding the description i'd have to write my own matcher that does
partial string matching.
The reason I brought up the UITableViewController was that I noticed that the
PaymentsPickerViewController already has this behavior:
http://imgur.com/a/4v9B8

+  return self.collectionView.accessibilityIdentifier;
+}
+
 #pragma mark - Private
 
 // Reconfigures the cell at |indexPath| by calling |configureCell:| with |item|.