Allowing registering arbitrary schemes as supporting the fetch API.

Source/platform/weborigin/SchemeRegistry.h

Index: Source/platform/weborigin/SchemeRegistry.h
diff --git a/Source/platform/weborigin/SchemeRegistry.h b/Source/platform/weborigin/SchemeRegistry.h
index e85d2bbec88c2cfb7286074719622f4faf9349b4..3e1edd332be232ad97f390d51c9f61ec8e1a35fa 100644
--- a/Source/platform/weborigin/SchemeRegistry.h
+++ b/Source/platform/weborigin/SchemeRegistry.h
@@ -91,6 +91,10 @@ public:
     static void registerURLSchemeAsAllowingServiceWorkers(const String& scheme);
     static bool shouldTreatURLSchemeAsAllowingServiceWorkers(const String& scheme);
 
+    // HTTP-like schemes that are treated as supporting the Fetch API.
+    static void registerURLSchemeAsSupportingFetchAPI(const String& scheme);
+    static bool shouldTreatURLSchemeAsSupportingFetchAPI(const String& scheme);
+
     // Allow resources from some schemes to load on a page, regardless of its
     // Content Security Policy.
     // This enum should be kept in sync with public/web/WebSecurityPolicy.h.