Record UMA for snackbars shown for all purposes

chrome/android/java/src/org/chromium/chrome/browser/bookmarks/BookmarkUndoController.java

Index: chrome/android/java/src/org/chromium/chrome/browser/bookmarks/BookmarkUndoController.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/bookmarks/BookmarkUndoController.java b/chrome/android/java/src/org/chromium/chrome/browser/bookmarks/BookmarkUndoController.java
index d1cba85805224d53f2d4eb6bc9ba6dd6374f2a7d..db48f545dd22a400a264fe58052bc1821ca74496 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/bookmarks/BookmarkUndoController.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/bookmarks/BookmarkUndoController.java
@@ -85,13 +85,15 @@ public class BookmarkUndoController extends BookmarkModelObserver implements
         if (titles.length == 1) {
             mSnackbarManager.showSnackbar(Snackbar.make(titles[0], this, Snackbar.TYPE_ACTION)
                     .setTemplateText(mContext.getString(R.string.undo_bar_delete_message))
-                    .setAction(mContext.getString(R.string.undo), null));
+                    .setAction(mContext.getString(R.string.undo), null)
+                    .setPurpose(Snackbar.UMA_BOOKMARK_DELETE_UNDO));
         } else {
             mSnackbarManager.showSnackbar(
                     Snackbar.make(String.format(Locale.getDefault(), "%d", titles.length), this,
                             Snackbar.TYPE_ACTION)
                     .setTemplateText(mContext.getString(R.string.undo_bar_multiple_delete_message))
-                    .setAction(mContext.getString(R.string.undo), null));
+                    .setAction(mContext.getString(R.string.undo), null)
+                    .setPurpose(Snackbar.UMA_BOOKMARK_DELETE_UNDO));
         }
     }
 }