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 8ce7f18b287fe0885a835bc862d313c02bbf2370..ed7e78a653d77828a978f4a7981900af2bd3464b 100644
--- a/chrome/browser/permissions/permission_context_base.cc
+++ b/chrome/browser/permissions/permission_context_base.cc
@@ -36,7 +36,6 @@
 // static
 const char PermissionContextBase::kPermissionsKillSwitchFieldStudy[] =
     "PermissionsKillSwitch";
-// static

[raymes, 2016/08/06 00:50:21]

nit: probably leave this // static as I think it is in-line with the style
guide.

[dominickn, 2016/08/08 02:18:28]

Done.

 const char PermissionContextBase::kPermissionsKillSwitchBlockedValue[] =
     "blocked";
 
@@ -233,6 +232,15 @@ void PermissionContextBase::PermissionDecided(
   }
 #endif
 
+  // Check if we should convert a dismiss decision into a block decision. This
+  // is gated on enabling the kBlockPromptsIfDismissedOften feature.
+  if (!persist &&
+      decision_auto_blocker_.Get().ShouldChangeDismissalToBlock(
+          profile_, requesting_origin, permission_type_)) {
+    persist = true;
+    content_setting = CONTENT_SETTING_BLOCK;
+  }
+
   NotifyPermissionSet(id, requesting_origin, embedding_origin, callback,
                       persist, content_setting);
 }