Add the requested url to requestResource trace event

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index 27f7aa1c4da11214ec03a1c2ae350bd25f784839..7a75de1185be46beefd34835b4b208ce18017360 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -39,6 +39,7 @@
 #include "platform/Logging.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
+#include "platform/TracedValue.h"
 #include "platform/mhtml/ArchiveResource.h"
 #include "platform/mhtml/ArchiveResourceCollection.h"
 #include "platform/weborigin/KnownPorts.h"
@@ -250,17 +251,23 @@ void ResourceFetcher::requestLoadStarted(Resource* resource, const FetchRequest&
     m_validatedURLs.add(request.resourceRequest().url());
 }
 
+static PassRefPtr<TraceEvent::ConvertableToTraceFormat> urlForTraceEvent(const KURL& url)
+{
+    RefPtr<TracedValue> value = TracedValue::create();
+    value->setString("url", url.string());
+    return value.release();
+}
+
 ResourcePtr<Resource> ResourceFetcher::requestResource(FetchRequest& request, const ResourceFactory& factory)
 {
     ASSERT(request.options().synchronousPolicy == RequestAsynchronously || factory.type() == Resource::Raw);
 
-    TRACE_EVENT0("blink", "ResourceFetcher::requestResource");
-
     context().upgradeInsecureRequest(request);
     context().addClientHintsIfNecessary(request);
     context().addCSPHeaderIfNecessary(factory.type(), request);
 
     KURL url = request.resourceRequest().url();
+    TRACE_EVENT1("blink", "ResourceFetcher::requestResource", "url", urlForTraceEvent(url));
 
     WTF_LOG(ResourceLoading, "ResourceFetcher::requestResource '%s', charset '%s', priority=%d, forPreload=%u, type=%s", url.elidedString().latin1().data(), request.charset().latin1().data(), request.priority(), request.forPreload(), ResourceTypeName(factory.type()));