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

chrome/browser/permissions/permission_queue_controller.cc

Index: chrome/browser/permissions/permission_queue_controller.cc
diff --git a/chrome/browser/permissions/permission_queue_controller.cc b/chrome/browser/permissions/permission_queue_controller.cc
index 3382aaadc0e6deedeec7514712f664eb18699061..38d92094002c9427497587c3041856e3d127a4cf 100644
--- a/chrome/browser/permissions/permission_queue_controller.cc
+++ b/chrome/browser/permissions/permission_queue_controller.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/permissions/permission_request.h"
 #include "chrome/browser/permissions/permission_request_id.h"
 #include "chrome/browser/permissions/permission_uma_util.h"
+#include "chrome/browser/permissions/permission_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
@@ -212,6 +213,15 @@ void PermissionQueueController::OnPermissionSet(const PermissionRequestID& id,
                                                 bool allowed) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
+  // Check if we should convert a dismiss decision into a block decision. This
+  // is gated on enabling the kBlockPromptsIfDismissedOften feature.
+  if (!update_content_setting &&
+      prompt_decision_log_.Get().ShouldChangeDismissalToBlock(
+          profile_, requesting_frame, permission_type_)) {
+    update_content_setting = true;
+    allowed = false;
+  }
+
   // TODO(miguelg): move the permission persistence to
   // PermissionContextBase once all the types are moved there.
   PermissionRequestGestureType gesture_type =