Refactor the API for setting dynamic resource load priorities

Source/core/fetch/ResourceFetcher.h

Index: Source/core/fetch/ResourceFetcher.h
diff --git a/Source/core/fetch/ResourceFetcher.h b/Source/core/fetch/ResourceFetcher.h
index 670f1caa456a862620e1608c0923403229c6e215..066cb6b9bc9008345d908a8119bb1ec0b83bea95 100644
--- a/Source/core/fetch/ResourceFetcher.h
+++ b/Source/core/fetch/ResourceFetcher.h
@@ -110,7 +110,6 @@ public:
     void didLoadResource();
     void redirectReceived(Resource*, const ResourceResponse&);
     void didFinishLoading(Resource*, double finishTime, int64_t encodedDataLength);
-    void didChangeLoadingPriority(const Resource*, ResourceLoadPriority, int intraPriorityValue);
     void didFailLoading(const Resource*, const ResourceError&);
     void willSendRequest(unsigned long identifier, ResourceRequest&, const ResourceResponse& redirectResponse, const FetchInitiatorInfo&);
     void didReceiveResponse(const Resource*, const ResourceResponse&);
@@ -132,7 +131,7 @@ public:
 
     void acceptDataFromThreadedReceiver(unsigned long identifier, const char* data, int dataLength, int encodedDataLength);
 
-    ResourceLoadPriority loadPriority(Resource::Type, const FetchRequest&);
+    ResourceLoadPriority loadPriority(Resource::Type, const FetchRequest&, ResourcePriority::VisibilityStatus = ResourcePriority::NotVisible);
 
     enum ResourceLoadStartType {
         ResourceLoadingFromNetwork,
@@ -147,6 +146,8 @@ public:
     bool clientDefersImage(const KURL&) const;
     void determineRequestContext(ResourceRequest&, Resource::Type);
 
+    void updateAllImageResourcePriorities();
+
 private:
     friend class ResourceCacheValidationSuppressor;