Add a feature for not compositing small scrollers

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index 7681cd24ef64a84f68aee7a33d4fd68d1c4fd719..4a8a76ffb901bdfc551b599ca8e6e4b6cb523491 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -143,6 +143,10 @@ const base::Feature kMemoryCoordinator {
   "MemoryCoordinator", base::FEATURE_DISABLED_BY_DEFAULT
 };
 
+// An experiment for not compositing small scrollers.
+const base::Feature kNotCompositeSmallScroller{
+    "NotCompositeSmallScroller", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Kill switch for Web Notification content images.
 const base::Feature kNotificationContentImage{"NotificationContentImage",
                                               base::FEATURE_ENABLED_BY_DEFAULT};