Add a warning whenever link preloads are not used

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 def2685b5e02f75e61d2765ba8cf9a6de37b01f1..9a580b0fdfc811bcfbea3f2918efd1e6059bd892 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
@@ -653,10 +653,11 @@ void FrameFetchContext::sendImagePing(const KURL& url)
     PingLoader::loadImage(frame(), url);
 }
 
-void FrameFetchContext::addConsoleMessage(const String& message) const
+void FrameFetchContext::addConsoleMessage(const String& message, LogMessageType messageType) const
 {
+    MessageLevel level = messageType == LogWarningMessage ? WarningMessageLevel : ErrorMessageLevel;
     if (frame()->document())
-        frame()->document()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message));
+        frame()->document()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, level, message));
 }
 
 SecurityOrigin* FrameFetchContext::getSecurityOrigin() const