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

chrome/browser/permissions/permission_context_base.h

Index: chrome/browser/permissions/permission_context_base.h
diff --git a/chrome/browser/permissions/permission_context_base.h b/chrome/browser/permissions/permission_context_base.h
index 2ab7b7bb8526f3d9729344db2b68602770009fdc..591276721ab1070ccb5da018bf0919342b61bc1c 100644
--- a/chrome/browser/permissions/permission_context_base.h
+++ b/chrome/browser/permissions/permission_context_base.h
@@ -9,9 +9,11 @@
 
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
+#include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
+#include "chrome/browser/permissions/permission_prompt_decision_log.h"
 #include "chrome/browser/permissions/permission_request.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ -165,6 +167,9 @@ class PermissionContextBase : public KeyedService {
   const ContentSettingsType content_settings_type_;
 #if defined(OS_ANDROID)
   std::unique_ptr<PermissionQueueController> permission_queue_controller_;
+#else
+  base::LazyInstance<PermissionPromptDecisionLog> prompt_decision_log_ =
+      LAZY_INSTANCE_INITIALIZER;
 #endif
   base::ScopedPtrHashMap<std::string, std::unique_ptr<PermissionRequest>>
       pending_requests_;