Add feature flag for StAMP and send the corresponding capabilities
when the feature is enabled.

Change-Id: I06b03df2d002f502319995dccf50dd6651c36389
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3134314
Reviewed-by: Dan H <[email protected]>
Commit-Queue: Jonathan Freed <[email protected]>
Cr-Commit-Position: refs/heads/main@{#918161}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 5eca69a..d595dcf 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -3117,6 +3117,9 @@
 const char kFeedInteractiveRefreshDescription[] =
     "Enables refreshing feeds triggered by the users.";
 
+const char kFeedStampName[] = "StAMP cards in the feed";
+const char kFeedStampDescription[] = "Enables StAMP cards in the feed.";
+
 const char kFillingPasswordsFromAnyOriginName[] =
     "Filling passwords from any origin";
 const char kFillingPasswordsFromAnyOriginDescription[] =