Add logging to CrossSiteResourceHandler and BufferedResourceHandler

content/browser/loader/cross_site_resource_handler.cc

Index: content/browser/loader/cross_site_resource_handler.cc
===================================================================
--- content/browser/loader/cross_site_resource_handler.cc	(revision 251072)
+++ content/browser/loader/cross_site_resource_handler.cc	(working copy)
@@ -173,7 +173,8 @@
   StartCrossSiteTransition(request_id, response, should_transfer);
 
   // Defer loading until after the onunload event handler has run.
-  did_defer_ = *defer = true;
+  *defer = true;
+  OnDidDefer();
   return true;
 }
 
@@ -217,8 +218,8 @@
 
   // Defer to tell RDH not to notify the world or clean up the pending request.
   // We will do so in ResumeResponse.
-  did_defer_ = true;
   *defer = true;
+  OnDidDefer();
 }
 
 // We can now send the response to the new renderer, which will cause
@@ -311,9 +312,15 @@
 
 void CrossSiteResourceHandler::ResumeIfDeferred() {
   if (did_defer_) {
+    request()->LogUnblocked();
     did_defer_ = false;
     controller()->Resume();
   }
 }
 
+void CrossSiteResourceHandler::OnDidDefer() {
+  did_defer_ = true;
+  request()->LogBlockedBy("CrossSiteResourceHandler");
+}
+
 }  // namespace content