[WIP] off-main-thread loading

third_party/WebKit/Source/platform/loader/fetch/Resource.h

Index: third_party/WebKit/Source/platform/loader/fetch/Resource.h
diff --git a/third_party/WebKit/Source/platform/loader/fetch/Resource.h b/third_party/WebKit/Source/platform/loader/fetch/Resource.h
index 878bd180330cbfe575cc740f476b4e1e654ba281..60f77acf7c8f88448731ef520d116af6a4cd3bd9 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/Resource.h
+++ b/third_party/WebKit/Source/platform/loader/fetch/Resource.h
@@ -48,6 +48,7 @@
 
 namespace blink {
 
+class FetchContext;
 class FetchRequest;
 class ResourceClient;
 class ResourceFetcher;
@@ -99,6 +100,14 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
     kReloadAlways,
   };
 
+  class ResourceCallback {
+   public:
+    virtual ~ResourceCallback() {}
+    virtual void schedule(Resource*) = 0;
+    virtual void cancel(Resource*) = 0;
+    virtual bool isScheduled(Resource*) const = 0;
+  };
+
   virtual ~Resource();
 
   DECLARE_VIRTUAL_TRACE();
@@ -337,8 +346,13 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
       Type,
       const AtomicString& fetchInitiatorName);
 
+  void finishPendingClients();
+
  protected:
-  Resource(const ResourceRequest&, Type, const ResourceLoaderOptions&);
+  Resource(const ResourceRequest&,
+           Type,
+           const ResourceLoaderOptions&,
+           FetchContext* = nullptr);
 
   virtual void checkNotify();
 
@@ -353,8 +367,6 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
   void setEncodedSize(size_t);
   void setDecodedSize(size_t);
 
-  void finishPendingClients();
-
   virtual void didAddClient(ResourceClient*);
   void willAddClientOrObserver(PreloadReferencePolicy);
 
@@ -409,7 +421,6 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
   };
 
  private:
-  class ResourceCallback;
   class CachedMetadataHandlerImpl;
   class ServiceWorkerResponseCachedMetadataHandler;
 
@@ -422,6 +433,8 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
 
   String reasonNotDeletable() const;
 
+  ResourceCallback& resourceCallback();
+
   // MemoryCoordinatorClient overrides:
   void onPurgeMemory() override;
 
@@ -476,6 +489,7 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
   double m_responseTimestamp;
 
   TaskRunnerTimer<Resource> m_cancelTimer;
+  Member<FetchContext> m_fetchContext;
 
   ResourceRequest m_resourceRequest;
   Member<ResourceLoader> m_loader;
@@ -490,7 +504,8 @@ class ResourceFactory {
  public:
   virtual Resource* create(const ResourceRequest&,
                            const ResourceLoaderOptions&,
-                           const String&) const = 0;
+                           const String&,
+                           FetchContext*) const = 0;
   Resource::Type type() const { return m_type; }
 
  protected: