Add metrics for 'upgrade-insecure-requests'.

Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 631 matching lines @@
         //
         // 1. Are for subresources (including nested frames).
         // 2. Are form submissions.
         // 3. Whose hosts are contained in the document's InsecureNavigationSet.
         const ResourceRequest& request = fetchRequest.resourceRequest();
         if (request.frameType() == WebURLRequest::FrameTypeNone
             || request.frameType() == WebURLRequest::FrameTypeNested
             || request.requestContext() == WebURLRequest::RequestContextForm
             || (!url.host().isNull() && m_document->insecureNavigationsToUpgrade()->contains(url.host().impl()->hash())))
         {
+            UseCounter::count(m_document, UseCounter::UpgradeInsecureRequestsUpgradedRequest);
             url.setProtocol("https");
             if (url.port() == 80)
                 url.setPort(443);
             fetchRequest.mutableResourceRequest().setURL(url);
         }
     }
 }
 
 void FrameFetchContext::addClientHintsIfNecessary(FetchRequest& fetchRequest)
 {
@@ skipping 18 matching lines @@
         fetchRequest.mutableResourceRequest().addHTTPHeaderField("CSP", "active");
 }
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink