Add a feature which, when enabled, blocks permissions after X prompt dismissals.

chrome/browser/permissions/permission_context_base.cc

Index: chrome/browser/permissions/permission_context_base.cc
diff --git a/chrome/browser/permissions/permission_context_base.cc b/chrome/browser/permissions/permission_context_base.cc
index f0fc52cbb09308d88950e6bfdf851895201c2cd0..696f51295c0cb14c01c455cf86d406cf1238468b 100644
--- a/chrome/browser/permissions/permission_context_base.cc
+++ b/chrome/browser/permissions/permission_context_base.cc
@@ -211,6 +211,15 @@ void PermissionContextBase::PermissionDecided(
 #if !defined(OS_ANDROID)
   // Infobar persistence and its related UMA is tracked on the infobar
   // controller directly.
+
+  // Check if we should convert a dismiss decision into a block decision. This
+  // is gated on enabling the kBlockPromptsIfDismissedOften feature.
+  if (!persist && PermissionUtil::ShouldChangeDismissalToBlock(
+                      profile_, requesting_origin, permission_type_)) {
+    persist = true;
+    content_setting = CONTENT_SETTING_BLOCK;
+  }
+
   if (persist) {
     DCHECK(content_setting == CONTENT_SETTING_ALLOW ||
            content_setting == CONTENT_SETTING_BLOCK);