Skeleton of the Safe Browsing Subresource Filter.

third_party/WebKit/public/web/WebDataSource.h

Index: third_party/WebKit/public/web/WebDataSource.h
diff --git a/third_party/WebKit/public/web/WebDataSource.h b/third_party/WebKit/public/web/WebDataSource.h
index a705fb41051e86b851598954db82be4225b49122..cd4fd5b026d2b51977a649286a9efbfdcf9ced17 100644
--- a/third_party/WebKit/public/web/WebDataSource.h
+++ b/third_party/WebKit/public/web/WebDataSource.h
@@ -37,6 +37,7 @@
 
 namespace blink {
 
+class WebDocumentSubresourceFilter;
 class WebURL;
 class WebURLRequest;
 class WebURLResponse;
@@ -104,6 +105,12 @@ public:
     // the user may have already recorded the original value.
     virtual void setNavigationStartTime(double) = 0;
 
+    // Allows the embedder to inject a filter that will be consulted for each
+    // subsequent subresource load, and gets the final say in deciding whether
+    // or not to allow the load. The passed-in filter object is deleted when the
+    // datasource is destroyed or when a new filter is set.
+    virtual void setSubresourceFilter(WebDocumentSubresourceFilter*) = 0;
+
 protected:
     ~WebDataSource() { }
 };