doc.write blocking intervention warning header

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

Index: third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
index 7fccf4bb176bb95e82ed23de68978db6595626f3..9fbdae7cff358fcab7f2f66bd4f841c713969196 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
@@ -107,9 +107,11 @@ bool isConnectionEffectively2G(WebEffectiveConnectionType effectiveType) {
   return false;
 }
 
-bool shouldDisallowFetchForMainFrameScript(const ResourceRequest& request,
-                                           FetchRequest::DeferOption defer,
-                                           Document& document) {
+bool shouldDisallowFetchForMainFrameScript(
+    const ResourceRequest& request,
+    FetchRequest::DeferOption defer,
+    Document& document,
+    std::pair<AtomicString, AtomicString>& customHeader) {
   // Only scripts inserted via document.write are candidates for having their
   // fetch disallowed.
   if (!document.isInDocumentWrite())
@@ -151,6 +153,10 @@ bool shouldDisallowFetchForMainFrameScript(const ResourceRequest& request,
     return false;
 
   emitWarningForDocWriteScripts(request.url().getString(), document);
+  customHeader.first = "Intervention";
+  customHeader.second =
+      "<https://www.chromestatus.com/feature/5718547946799104>; "
+      "level=\"warning\"";
 
   // Do not block scripts if it is a page reload. This is to enable pages to
   // recover if blocking of a script is leading to a page break and the user
@@ -297,7 +303,8 @@ static WebCachePolicy memoryCachePolicyToResourceRequestCachePolicy(
 WebCachePolicy FrameFetchContext::resourceRequestCachePolicy(
     const ResourceRequest& request,
     Resource::Type type,
-    FetchRequest::DeferOption defer) const {
+    FetchRequest::DeferOption defer,
+    std::pair<AtomicString, AtomicString>& customHeader) const {
   DCHECK(frame());
   if (type == Resource::MainResource) {
     FrameLoadType frameLoadType = frame()->loader().loadType();
@@ -330,7 +337,8 @@ WebCachePolicy FrameFetchContext::resourceRequestCachePolicy(
   // the main frame on script loads inserted via document.write, since it can
   // add significant delays before page content is displayed on the screen.
   if (type == Resource::Script && isMainFrame() && m_document &&
-      shouldDisallowFetchForMainFrameScript(request, defer, *m_document))
+      shouldDisallowFetchForMainFrameScript(request, defer, *m_document,
+                                            customHeader))
     return WebCachePolicy::ReturnCacheDataDontLoad;
 
   if (request.isConditional())