Allowing registering arbitrary schemes as supporting the fetch API.

Source/platform/weborigin/SchemeRegistry.cpp

Index: Source/platform/weborigin/SchemeRegistry.cpp
diff --git a/Source/platform/weborigin/SchemeRegistry.cpp b/Source/platform/weborigin/SchemeRegistry.cpp
index 822ae67a5fe8b98591ec9a7d7fae47c79435fcb1..099dbbb17a03895397bf9870779e686e6c41353c 100644
--- a/Source/platform/weborigin/SchemeRegistry.cpp
+++ b/Source/platform/weborigin/SchemeRegistry.cpp
@@ -176,6 +176,19 @@ static URLSchemesSet& serviceWorkerSchemes()
     return serviceWorkerSchemes;
 }
 
+static URLSchemesSet& fetchAPISchemes()
+{
+    assertLockHeld();
+    DEFINE_STATIC_LOCAL_NOASSERT(URLSchemesSet, fetchAPISchemes, ());
+
+    if (fetchAPISchemes.isEmpty()) {
+        fetchAPISchemes.add("http");
+        fetchAPISchemes.add("https");
+    }
+
+    return fetchAPISchemes;
+}
+
 static URLSchemesMap<SchemeRegistry::PolicyAreas>& ContentSecurityPolicyBypassingSchemes()
 {
     assertLockHeld();
@@ -353,6 +366,20 @@ bool SchemeRegistry::shouldTreatURLSchemeAsAllowingServiceWorkers(const String&
     return serviceWorkerSchemes().contains(scheme);
 }
 
+void SchemeRegistry::registerURLSchemeAsSupportingFetchAPI(const String& scheme)
+{
+    MutexLocker locker(mutex());
+    fetchAPISchemes().add(scheme);
+}
+
+bool SchemeRegistry::shouldTreatURLSchemeAsSupportingFetchAPI(const String& scheme)
+{
+    if (scheme.isEmpty())
+        return false;
+    MutexLocker locker(mutex());
+    return fetchAPISchemes().contains(scheme);
+}
+
 void SchemeRegistry::registerURLSchemeAsBypassingContentSecurityPolicy(const String& scheme, PolicyAreas policyAreas)
 {
     MutexLocker locker(mutex());