Revert of Revert "Post loading tasks on the appropriate WebFrameScheduler's queue."

third_party/WebKit/Source/core/fetch/FetchContext.h

Index: third_party/WebKit/Source/core/fetch/FetchContext.h
diff --git a/third_party/WebKit/Source/core/fetch/FetchContext.h b/third_party/WebKit/Source/core/fetch/FetchContext.h
index 054b465dfae220746c9b9b8be9950a086ef7cc26..22869f183ccb464d053f32eb0b0b1cd3ef6e6766 100644
--- a/third_party/WebKit/Source/core/fetch/FetchContext.h
+++ b/third_party/WebKit/Source/core/fetch/FetchContext.h
@@ -48,6 +48,7 @@
 class ResourceResponse;
 class ResourceRequest;
 class ResourceTimingInfo;
+class WebTaskRunner;
 
 enum FetchResourceType {
     FetchMainResource,
@@ -106,6 +107,8 @@
 
     virtual ResourceLoadPriority modifyPriorityForExperiments(ResourceLoadPriority priority, Resource::Type, const FetchRequest&, ResourcePriority::VisibilityStatus) { return priority; }
 
+    virtual WebTaskRunner* loadingTaskRunner() const { return nullptr; }
+
 protected:
     FetchContext() { }
 };