Introduce SubframeNavigationFilteringThrottle

components/subresource_filter/content/browser/async_document_subresource_filter.cc

 // Copyright 2017 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 "components/subresource_filter/content/browser/async_document_subresource_filter.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 110 matching lines @@
   DCHECK(verified_ruleset);
 
   const MemoryMappedRuleset* ruleset = verified_ruleset->Get();
   if (!ruleset)
     return ActivationState(ActivationLevel::DISABLED);
 
   ActivationState activation_state =
       ComputeActivationState(params.document_url, params.parent_document_origin,
                              params.parent_activation_state, ruleset);
 
-  filter_.emplace(url::Origin(params.document_url), activation_state, ruleset,
-                  base::OnceClosure());
+  if (activation_state.activation_level != ActivationLevel::DISABLED) {

[pkalinnikov, 2017/02/14 12:11:06]

You can remove this check, I have modified to dependee CL.

[Charlie Harrison, 2017/02/14 14:09:38]

Done.

+    filter_.emplace(url::Origin(params.document_url), activation_state, ruleset,
+                    base::OnceClosure());
+  }
 
   return activation_state;
 }
 
 }  // namespace subresource_filter