Expose the GC under a name that is less collision prone than window.gc.

src/bootstrapper.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2165 matching lines @@
   Isolate* isolate = native_context->GetIsolate();
   ExtensionStates extension_states;  // All extensions have state UNVISITED.
   // Install auto extensions.
   v8::RegisteredExtension* current = v8::RegisteredExtension::first_extension();
   while (current != NULL) {
     if (current->extension()->auto_enable())
       InstallExtension(isolate, current, &extension_states);
     current = current->next();
   }
 
-  if (FLAG_expose_gc) InstallExtension(isolate, "v8/gc", &extension_states);
+  if (FLAG_expose_gc || FLAG_expose_gc_as)
+    InstallExtension(isolate, "v8/gc", &extension_states);
   if (FLAG_expose_externalize_string) {
     InstallExtension(isolate, "v8/externalize", &extension_states);
   }
   if (FLAG_track_gc_object_stats) {
     InstallExtension(isolate, "v8/statistics", &extension_states);
   }
 
   if (extensions == NULL) return true;
   // Install required extensions
   int count = v8::ImplementationUtilities::GetNameCount(extensions);
@@ skipping 357 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal