[instrumentation] Generalize instrumentation to be used beyond the core layer

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
index f7fcd772965cc5c12ac3a9c865d8872eae65906a..bbbd07160947971f1e0664ae5caadb2d2303d772 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
@@ -29,6 +29,7 @@
 
 #include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "platform/instrumentation/PlatformInstrumentation.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "platform/instrumentation/tracing/TracedValue.h"
 #include "platform/loader/fetch/FetchContext.h"
@@ -1247,8 +1248,13 @@ bool ResourceFetcher::startLoad(Resource* resource) {
   }
 
   ResourceRequest request(resource->resourceRequest());
-  context().dispatchWillSendRequest(resource->identifier(), request,
-                                    ResourceResponse(),
+  ResourceResponse response;
+
+  blink::probe::PlatformSendRequest probe(&context(), resource->identifier(),
+                                          request, response,
+                                          resource->options().initiatorInfo);
+
+  context().dispatchWillSendRequest(resource->identifier(), request, response,
                                     resource->options().initiatorInfo);
 
   // TODO(shaochuan): Saving modified ResourceRequest back to |resource|, remove