Refactor the API for setting dynamic resource load priorities

Source/platform/network/ResourceLoadPriority.h

Index: Source/platform/network/ResourceLoadPriority.h
diff --git a/Source/platform/network/ResourceLoadPriority.h b/Source/platform/network/ResourceLoadPriority.h
index b6178b96d22a1f3e96a1a00c692cf7caaa44cce3..2a2b2d344bf207dd3191d575b1c767b68bf82640 100644
--- a/Source/platform/network/ResourceLoadPriority.h
+++ b/Source/platform/network/ResourceLoadPriority.h
@@ -41,6 +41,24 @@ enum ResourceLoadPriority {
     ResourceLoadPriorityHighest = ResourceLoadPriorityVeryHigh,
 };
 
+struct ResourcePriority {
+public:
+    enum VisibilityStatus {
+        NotVisible,
+        Visible,
+    };
+
+    ResourcePriority() : ResourcePriority(NotVisible, 0) { }
+    ResourcePriority(VisibilityStatus status, int intraValue)
+        : visibility(status)
+        , intraPriorityValue(intraValue)
+    {
+    }
+
+    VisibilityStatus visibility;
+    int intraPriorityValue;
+};
+
 }
 
 #endif