[not for commit] Add necessary code to enable per-request CPU benchmarking

third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp

Index: third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp b/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
index 59a96fcbacc43add98b3f2131979416e0dbe0917..ed15be521a8b86a611c74df8a8c0ccebe6d4e5fe 100644
--- a/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp
@@ -468,7 +468,7 @@ Resource* ResourceFetcher::requestResource(
       request.getResourceWidth(), resourceRequest);
 
   // TODO(dproy): Remove this. http://crbug.com/659666
-  TRACE_EVENT1("blink", "ResourceFetcher::requestResource", "url",
+  TRACE_EVENT1("blink,loading", "ResourceFetcher::requestResource", "url",
                urlForTraceEvent(request.url()));
 
   if (!request.url().isValid())