Replicate a parsed feature policy representation so it doesn't need to be parsed in the browser pro…

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index 53e0d94e769a85411bb3d38ba5f7605240fbfa6d..07ecb362b53fcc93f746c3f70240950097161913 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -585,15 +585,19 @@ void FrameLoader::didBeginDocument() {
           m_documentLoader->response().httpHeaderField(
               HTTPNames::Feature_Policy);
       Vector<String> messages;
+      const WebVector<WebFeaturePolicy::ParsedWhitelist>&
+          parsedFeaturePolicyHeaders = FeaturePolicy::parseFeaturePolicy(
+              featurePolicyHeader,
+              m_frame->securityContext()->getSecurityOrigin(), &messages);
       m_frame->securityContext()->setFeaturePolicyFromHeader(
-          featurePolicyHeader, parentSecurityContext, &messages);
+          parsedFeaturePolicyHeaders, parentSecurityContext);
       for (auto& message : messages) {
         m_frame->document()->addConsoleMessage(ConsoleMessage::create(
             OtherMessageSource, ErrorMessageLevel,
             "Error with Feature-Policy header: " + message));
       }
-      if (client() && !featurePolicyHeader.isEmpty())
-        client()->didSetFeaturePolicyHeader(featurePolicyHeader);
+      if (client() && !parsedFeaturePolicyHeaders.isEmpty())
+        client()->didSetFeaturePolicyHeader(parsedFeaturePolicyHeaders);
     }
   }