Add metrics for 'upgrade-insecure-requests'.

Source/core/loader/FrameFetchContext.cpp

Index: Source/core/loader/FrameFetchContext.cpp
diff --git a/Source/core/loader/FrameFetchContext.cpp b/Source/core/loader/FrameFetchContext.cpp
index 12e520dda4a50f4af253a44315eb1855b3b6dc06..69775e99db5a706201e2c1385c9cafd9967bedcb 100644
--- a/Source/core/loader/FrameFetchContext.cpp
+++ b/Source/core/loader/FrameFetchContext.cpp
@@ -649,6 +649,7 @@ void FrameFetchContext::upgradeInsecureRequest(FetchRequest& fetchRequest)
             || 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);