[WIP2] off-main-thread loading

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
index e4c39255ed614560fbdab5bc14d63cfce65d0556..e88f6ec8939131bea00839a97c129b187dd56571 100644
--- a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
@@ -393,7 +393,10 @@ void DocumentThreadableLoader::MakeCrossOriginAccessRequest(
     bool should_force_preflight = request.IsExternalRequest();
     if (!should_force_preflight)
       probe::shouldForceCORSPreflight(GetDocument(), &should_force_preflight);
+    // TODO(horo): Move CrossOriginPreflightResultCache to
+    // ThreadableLoadingContext
     bool can_skip_preflight =
+        IsMainThread() &&
         CrossOriginPreflightResultCache::Shared().CanSkipPreflight(
             GetSecurityOrigin()->ToString(), cross_origin_request.Url(),
             EffectiveAllowCredentials(), cross_origin_request.HttpMethod(),
@@ -769,9 +772,13 @@ void DocumentThreadableLoader::HandlePreflightResponse(
     return;
   }
 
-  CrossOriginPreflightResultCache::Shared().AppendEntry(
-      GetSecurityOrigin()->ToString(), actual_request_.Url(),
-      std::move(preflight_result));
+  if (IsMainThread()) {
+    // TODO(horo): Move CrossOriginPreflightResultCache to
+    // ThreadableLoadingContext
+    CrossOriginPreflightResultCache::Shared().AppendEntry(
+        GetSecurityOrigin()->ToString(), actual_request_.Url(),
+        std::move(preflight_result));
+  }
 }
 
 void DocumentThreadableLoader::ReportResponseReceived(
@@ -781,7 +788,7 @@ void DocumentThreadableLoader::ReportResponseReceived(
   if (!frame)
     return;
   DocumentLoader* loader = frame->Loader().GetDocumentLoader();
-  probe::didReceiveResourceResponse(frame, identifier, loader, response,
+  probe::didReceiveResourceResponse(GetDocument(), identifier, loader, response,
                                     GetResource());
   frame->Console().ReportResourceResponseReceived(loader, identifier, response);
 }