DO NOT COMMIT: hack hack hacking on preloading md-settings

content/browser/webui/url_data_manager_backend.cc

Index: content/browser/webui/url_data_manager_backend.cc
diff --git a/content/browser/webui/url_data_manager_backend.cc b/content/browser/webui/url_data_manager_backend.cc
index 404e834ca0d7542a3723e37baa9e0370a4958f98..7779f5190c0f6cec441652e82db58735acce148a 100644
--- a/content/browser/webui/url_data_manager_backend.cc
+++ b/content/browser/webui/url_data_manager_backend.cc
@@ -185,6 +185,10 @@ class URLRequestChromeJob : public net::URLRequestJob {
     access_control_allow_origin_ = value;
   }
 
+  void set_preload_headers(const std::vector<std::string>& preload_headers) {
+    preload_headers_ = preload_headers;
+  }
+
   // Returns true when job was generated from an incognito profile.
   bool is_incognito() const {
     return is_incognito_;
@@ -247,6 +251,8 @@ class URLRequestChromeJob : public net::URLRequestJob {
   // True when job is generated from an incognito profile.
   const bool is_incognito_;
 
+  std::vector<std::string> preload_headers_;
+
   // The backend is owned by net::URLRequestContext and always outlives us.
   URLDataManagerBackend* backend_;
 
@@ -355,6 +361,10 @@ void URLRequestChromeJob::GetResponseInfo(net::HttpResponseInfo* info) {
                              access_control_allow_origin_);
     info->headers->AddHeader("Vary: Origin");
   }
+
+  for (const std::string& preload_header : preload_headers_) {
+    info->headers->AddHeader(preload_header);
+  }
 }
 
 void URLRequestChromeJob::MimeTypeAvailable(const std::string& mime_type) {
@@ -635,6 +645,7 @@ bool URLDataManagerBackend::StartRequest(const net::URLRequest* request,
       source->source()->ShouldDenyXFrameOptions());
   job->set_send_content_type_header(
       source->source()->ShouldServeMimeTypeAsContentTypeHeader());
+  job->set_preload_headers(source->source()->GetPreloadHeaders());
 
   std::string origin = GetOriginHeaderValue(request);
   if (!origin.empty()) {