Part 2.3: Is policy list subsumed under subsuming policy?

third_party/WebKit/Source/core/frame/csp/SourceListDirective.h

Index: third_party/WebKit/Source/core/frame/csp/SourceListDirective.h
diff --git a/third_party/WebKit/Source/core/frame/csp/SourceListDirective.h b/third_party/WebKit/Source/core/frame/csp/SourceListDirective.h
index cfa961b9d10d500a013e0b3ee76022da81189d8c..bd4dc4298f45d4529bcf5de551d16bbe48028940 100644
--- a/third_party/WebKit/Source/core/frame/csp/SourceListDirective.h
+++ b/third_party/WebKit/Source/core/frame/csp/SourceListDirective.h
@@ -48,6 +48,8 @@ class CORE_EXPORT SourceListDirective final : public CSPDirective {
 
  private:
   FRIEND_TEST_ALL_PREFIXES(SourceListDirectiveTest, GetIntersectCSPSources);
+  FRIEND_TEST_ALL_PREFIXES(SourceListDirectiveTest,
+                           GetIntersectCSPSourcesSchemes);
 
   bool parseSource(const UChar* begin,
                    const UChar* end,
@@ -86,6 +88,8 @@ class CORE_EXPORT SourceListDirective final : public CSPDirective {
   bool hasSourceMatchInList(const KURL&, ResourceRequest::RedirectStatus) const;
   HeapVector<Member<CSPSource>> getIntersectCSPSources(
       HeapVector<Member<CSPSource>> other);
+  HashMap<String, CSPSource*> getIntersectSchemesOnly(
+      HeapVector<Member<CSPSource>> other);
 
   Member<ContentSecurityPolicy> m_policy;
   HeapVector<Member<CSPSource>> m_list;