Add logging to CrossSiteResourceHandler and BufferedResourceHandler,

when they block a URLRequest.

BUG=294920

Review URL: https://codereview.chromium.org/153503004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251161 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/loader/buffered_resource_handler.cc

@@ -334,6 +334,7 @@ bool BufferedResourceHandler::SelectNextHandler(bool* defer) {
       PluginServiceImpl::GetInstance()->GetPlugins(
           base::Bind(&BufferedResourceHandler::OnPluginsLoaded,
                      weak_ptr_factory_.GetWeakPtr()));
+      request()->LogBlockedBy("BufferedResourceHandler");
       *defer = true;
       return true;
     }
@@ -473,6 +474,7 @@ bool BufferedResourceHandler::CopyReadBufferToNextHandler(int request_id) {
 
 void BufferedResourceHandler::OnPluginsLoaded(
     const std::vector<WebPluginInfo>& plugins) {
+  request()->LogUnblocked();
   bool defer = false;
   if (!ProcessResponse(&defer)) {
     controller()->Cancel();

content/browser/loader/cross_site_resource_handler.cc

@@ -176,7 +176,8 @@ bool CrossSiteResourceHandler::OnResponseStarted(
   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;
 }
 
@@ -220,8 +221,8 @@ void CrossSiteResourceHandler::OnResponseCompleted(
 
   // 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
@@ -314,9 +315,15 @@ void CrossSiteResourceHandler::StartCrossSiteTransition(
 
 void CrossSiteResourceHandler::ResumeIfDeferred() {
   if (did_defer_) {
+    request()->LogUnblocked();
     did_defer_ = false;
     controller()->Resume();
   }
 }
 
+void CrossSiteResourceHandler::OnDidDefer() {
+  did_defer_ = true;
+  request()->LogBlockedBy("CrossSiteResourceHandler");
+}
+
 }  // namespace content

content/browser/loader/cross_site_resource_handler.h

@@ -55,6 +55,10 @@ class CrossSiteResourceHandler : public LayeredResourceHandler {
 
   void ResumeIfDeferred();
 
+  // Called when about to defer a request.  Sets |did_defer_| and logs the
+  // defferral
+  void OnDidDefer();
+
   bool has_started_response_;
   bool in_cross_site_transition_;
   bool completed_during_transition_;