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

chrome/browser/permissions/permission_context_base.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/permissions/permission_context_base.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 198 matching lines @@
     bool user_gesture,
     const BrowserPermissionCallback& callback,
     bool persist,
     ContentSetting content_setting) {
 #if !defined(OS_ANDROID)
   // Infobar persistence and its related UMA is tracked on the infobar
   // controller directly.
   PermissionRequestGestureType gesture_type =
       user_gesture ? PermissionRequestGestureType::GESTURE
                    : PermissionRequestGestureType::NO_GESTURE;
+
+  // Check if we should convert a dismiss decision into a block decision. This
+  // is gated on enabling the kBlockPromptsIfDismissedOften feature.
+  if (!persist &&
+      prompt_decision_log_.Get().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);
     if (content_setting == CONTENT_SETTING_ALLOW) {
       PermissionUmaUtil::PermissionGranted(permission_type_, gesture_type,
                                            requesting_origin, profile_);
     } else {
       PermissionUmaUtil::PermissionDenied(permission_type_, gesture_type,
                                           requesting_origin, profile_);
     }
@@ skipping 63 matching lines @@
                                       content_setting);
 }
 
 bool PermissionContextBase::IsPermissionKillSwitchOn() const {
   const std::string param = variations::GetVariationParamValue(
       kPermissionsKillSwitchFieldStudy,
       PermissionUtil::GetPermissionString(permission_type_));
 
   return param == kPermissionsKillSwitchBlockedValue;
 }