Introduce SubframeNavigationFilteringThrottle

components/subresource_filter/content/browser/async_document_subresource_filter.cc

Index: components/subresource_filter/content/browser/async_document_subresource_filter.cc
diff --git a/components/subresource_filter/content/browser/async_document_subresource_filter.cc b/components/subresource_filter/content/browser/async_document_subresource_filter.cc
index 2716f890169f5e50d6e51efc6763ca15c5e5391b..680256901dd23be9e72018ed036eadd8ce4f36eb 100644
--- a/components/subresource_filter/content/browser/async_document_subresource_filter.cc
+++ b/components/subresource_filter/content/browser/async_document_subresource_filter.cc
@@ -128,8 +128,10 @@ ActivationState AsyncDocumentSubresourceFilter::Core::Initialize(
       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;
 }