Implement GENERICBLOCK option.

components/subresource_filter/content/renderer/document_subresource_filter.h

Index: components/subresource_filter/content/renderer/document_subresource_filter.h
diff --git a/components/subresource_filter/content/renderer/document_subresource_filter.h b/components/subresource_filter/content/renderer/document_subresource_filter.h
index 1c3a1dd33449394d187b084413bec156b64df3cc..6cea6bc24b0aa24a6e8b70f8d74dc232bf831db7 100644
--- a/components/subresource_filter/content/renderer/document_subresource_filter.h
+++ b/components/subresource_filter/content/renderer/document_subresource_filter.h
@@ -84,6 +84,11 @@ class DocumentSubresourceFilter
   // activation type.
   bool filtering_disabled_for_document_ = false;
 
+  // Indicates whether the document is subject to a whitelist rule with
+  // GENERICBLOCK activation type. Undefined if
+  // |filtering_disabled_for_document_|.
+  bool generic_blocking_rules_disabled_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(DocumentSubresourceFilter);
 };